Our Third Annual Guide to Outdoor Recreation 

From leisurely walking tours to a brisk swim from Alcatraz, the highlights of the season's recreational sports calendar.

Wednesday, June 23

Downtown Walking Tours of Oakland Eight different ninety-minute tour itineraries, varying from day to day. Explore the Jack London waterfront, Chinatown, Preservation Park, Uptown, and many Oakland landmarks and monuments with a knowledgeable, experienced guide. Free tours run through October 31 every Wednesday and Saturday at 10:00 a.m. Info: 510-238-3234 or Oaklandnet.com/walkingtours

Thursday, June 24

Thursday Birding at Big Break The salty taste of marsh, the wind-blown cry of a gull, and the neatly camouflaged shore birds among the ice plants are a great way to start your morning. 9 a.m.-11 a.m. on the Big Break Regional Park Trail in Oakley. Call for registration: 925-757-2620.

Friday, June 25

Critical Mass in SF Don't dodge the traffic; become the traffic. Meet at Justin Herman Plaza at 5:30 p.m. the last Friday of every month.

Saturday, June 26

American Cancer Society Relay for Life A fun and unique 24-hour event to increase cancer awareness in Livermore while raising money for the ACS. Teams and individuals raise funds prior to the event, then team members take turns walking or running around the Livermore High School track, relay-style, and enjoy games and entertainment off the track. 9 a.m.-9 p.m. Contact Karen Crowson at 925-453-3420.

Downtown Walking Tours of Oakland See June 23 listing.

DSE Double Dipsea 13.7M Over and back on the famous rugged Dipsea Trail. Handicap race. Meet at Stinson Beach parking lot. Handicap start 8:15 a.m.; second wave 9 a.m. $30 preregistration, $40 after June 21. T-shirt included with registration. Race-day entry allowed from 6:15-8:00 a.m. For more information, visit DSERunners.com or call 415-586-3104.

Family Sundown Safari at the Oakland Zoo Spend a night behind the scenes at the zoo; meet the animals and see their nocturnal habits; cozy up around a campfire for folktales and African drumming. In the morning, breakfast will be served at the Island Cafe and you can meet the zookeepers and tour the zoo before the gates open. Bring your own tent and sleeping bags. $60 adult, $40 child; nonmembers $75 adult, $55 child. Reservations required. 510-632-9525 x100, www.oaklandzoo.org

Giro di Peninsula It's an Italian bike ride. Start and finish at the Bay Meadows racetrack with food, music, rest stops, prizes, and a T-shirt. There are five courses for every level of energy: 100M, 100K, 70K, 30K, and 30K EZ. Register soon, as the limit on participants is 1,500. Adult registration is $35, youth is $20, and tandem is $65. Also, the proceeds (to which you are encouraged to contribute more than the entry fee) benefit the developmentally disabled. 650-349-9879, GirodiPeninsula.org/giro.html

King of the Lake Disc Golf Tournament Three courses in one day: Truckee (18 holes), Zephyr Cove (18) on Nevada side, Bijou (27). Pro entry $45, amateur and advanced $40 (add $5 if you're not a PDGA member). Lunch is provided at Bijou before the third round. Souvenir tie-dyed socks and mini with entry fee. Trophies to third place for amateur and advanced. Discs for the pros. Check-in at 6:30 a.m. at Truckee course, 8 a.m. start. Contact Russ Wey to register: 530-542-3432. PDGA-sanctioned.

Lake Sonoma 2M Open Water Swim Loop course at Lake Sonoma (Yorty Creek Swimming Area: take Hwy 101 north to Cloverdale. Exit S. Cloverdale Blvd. and head west. Turn right on S. Cloverdale, left on W. Brookside, left on Foothill Rd., and veer right on Hot Springs Rd.). Includes T-shirt. Starts 8 a.m. $25 preregistration; $30 after and on race day (same-day registration 6:30-7:30 a.m.). Info: redwoodcoastopenwater@yahoo.com or 707-528-4718

Quest for Fire Seen the movie? Now be the primitive. Learn several hands-on methods for making fire including hand drill, bow drill, and flint-and-steel, culminating in a fire for lunch. 10 a.m.-1 p.m. Admission: $10 adult, $5 child (ten and up). Registration required; 510-636-1684.

San Francisco FrontRunners 2004 Pride Run 5K run/walk and 10K run. Both events take place at the South Polo Fields in Golden Gate Park (off Middle Drive West), begin at 9 a.m., and are USTAF-certified. $25 if postmarked by June 18; $30 after and day of the race. Race-day registration begins 7:30 a.m. Potluck picnic sponsored by San Francisco FrontRunners. Info: 415-978-2429, PrideRun.SFFrontRunners.org. or e-mail racedirector@sffrontrunners.org

Volleyball at Allendale Every Saturday through August 21, come out and learn volley technique, serving and team skills, and participate in a scrimmage; coed; ages five and up. Free. 12:30-4:30 p.m. 3711 Sutter St., Oakland. Contact Herb Chan: 510-535-5635. Sunday, June 27 Advanced Fly Casting For fly fisherpersons who already know how to shoot line, roll, pick up, lay down, and false cast. Come and improve your skills and learn how to analyze your stroke and make corrections, mend line, improve your water-reading skills, choose flies, and exercise on-stream etiquette; advanced presentation casts will also be covered. At Shadow Cliffs, 8:30 a.m.-2:30 p.m. $60 (fifteen and up). Register: 510-636-1684.

American Cancer Society Relay for Life See June 26 listing.

Lake Merritt Joggers and Striders Fourth Sunday Runs 5K, 10K, 15K, Walk. A USATF-certified flat-loop course. Meet at Old Boathouse at Lake Merritt in Oakland. Race begins at 9 a.m. Entry fee $3, $4 nonmembers; race-day entry only. 510-644-4224, LMJS.org

Presidio Relay and 5K At Crissy Field in the Presidio National Park, SF. Relay distance is 20K (12.4 miles) in four 5km loops. Starts 8 a.m. Open and corporate team challenges, professional chip timing, finisher T-shirt, food tent, sponsor giveaways, team and age group awards. $35 per person until June 25, $40 after and on race day. Benefits Huntington's Disease Society of America. 415-409-5900 or PresidioRelay.com

Seventh Annual Run for the Law Includes both 5K Run & Walk and 10K Run & Corporate Challenge. Top three finishers in every age category will receive medals. Registration is at 7:00 a.m. at the West Valley Court House, 14205 Capri Drive, Los Gatos. Start time 8:30 a.m. $25 preregistered, $23 per runner preregistered for groups of five or more, $30 race day. Fees include T-shirt and post-race refreshments. Make checks payable to Law Foundation of Silicon Valley. Send registration to On Your Mark, P.O. Box 1199, Arnold, CA 95223. Proceeds go to nonprofit legal groups including Legal Advocates for Children & Youth. For more information about the Law Foundation, call 408-280-2433. For run information, call 209-795-7832 or visit OnYourMarkEvents.com

Tuesday, June 29

Birding by Bike The migration is over and the locals are nesting. Spot some secretive owls or clapper rails. Bring a bike and helmet to the observation deck at the end of the driveway off Swan Way at the MLK Jr. Shoreline/San Leandro Bay in South Oakland. 4-5:30 p.m. Call to reserve binoculars: 510-525-2233.

Over-the-Hills-Gang Hikers 55 and older who are interested in history, nature, and fun, come explore Wildcat Canyon/Alvarado, the area once known as the Grand Canyon Park. 10 a.m.-noon. Registration required; 510-525-2233.

Tuesday Teatime Trekkers Every Tuesday in June, July, and August, engage in the British tradition of combining physical exertion, nature study, and teatime. Jan Southworth and Dorothy Estacio will guide you on an hour-long hike (mellow to vigorous) through marsh and meadow while enhancing your knowledge of flora and fauna. After the hike, tea and snack (with recipe) are served. $3 per person ($35 for entire series). Registration required. 510-795-9385.

Tuesday Twilights Hike a three-quarter-mile trail in Sunol up to the giant cactus patch under a full moon. Look out over Little Yosemite and howl. Bring hiking shoes, water, and a flashlight. At the Sunol-Ohlone Regional Wilderness. 7 p.m.-9:15 p.m. Call 925-862-2601 for details.

Wednesday, June 30

Downtown Walking Tours of Oakland See June 23 listing.

Full Moon Paddle Kayaking under the full moon in the Lake Chabot Marina. In-depth instruction for paddling calm water; for beginner to intermediate levels. Kids welcome (five and up), $59 individual. 7-10 p.m.. Call to register: 510-636-1684.

Saturday, July 3

Cricket Festival For the past few years, this festival and competition featuring teams chosen by region has taken place during the first week of July. This year's schedule is TBA, so check out BayAreaCricket.org for the latest.

Downtown Walking Tours of Oakland See June 23 listing.

Graeagle 5K/10K Run, Walk, Stride Flat, scenic road and trail in beautiful Mohawk Valley. Medals and T-shirts to all. 9 a.m. at Graeagle Real Estate in Graeagle, 47 miles north of Truckee. $15, $20 on race day. Info: 510-223-5778.

Hernia Hill Half Marathon 10K, 5K Run/Walk, 1M Kids' Run. This sixteenth annual event includes a barbecue, awards, and prize money for breaking course records. Scenic out and back, paved and fire trail with some hernia hills. Races start 8:30 a.m. Meet at Historic Avery Hotel (Hwy 4 Moran Rd) in Avery. $20 preregister, $25 race day; all distances include BBQ & T-shirt. Register online at Active.com. Info: 209-795-7832 or OnYourMarkEvents.com

Sunday, July 4

DSE Lake Merced Run: 4.6M Race begins at 9:00 a.m. at Lake Merced in San Francisco. Kids race at 9:45 a.m. $2, $5 nonmembers; race-day entry permitted. DSERunners.com or 415-978-0837.

Kenwood Footrace 3K/10K The 31st annual Kenwood Footrace is the oldest and second-largest running event in Sonoma County. Run on scenic, wine country roads, USTAF-certified. Stay for the Fourth of July Parade and pancake breakfast. Free entry with race bib to World Championship Pillow Fights and related festivities (food, music, entertainment). Races start at 7:30 a.m. at Plaza Park in Kenwood. $20 entry fee before June 29, $25 after. Race-day registration permitted. 707-569-1494.

Morgan Hill Freedom 5000 Meter Race: Run/Walk A family festival that includes breakfast, goody bag, and Fourth of July Parade after race. Two loops; paved, flat, fast course. Start at PA Walsh School, 353 W. Main. Race begins at 8 a.m. $23 before June 28 or $25 day of race (register 6:15-7:30 a.m.) MHIDI.com, e-mail charles@wmarchitects.com, or call Charles at 408-779-6686.

Run San Ramon Independence Day Classic 5K/10K A paved loop course at San Ramon Central Park. The 5K run/walk and 3K fun walk begin at 8:30 a.m.; the 10K run at 8:45 a.m. $20 postmarked by June 21 and $25 on race day. Preregistration family rate for three or more is $17 per person. Race-day registration tables open 7-8:00 a.m. Mayor's Cup to winning preregistered San Ramon resident, male and female (both races). Trophies to winning male and female (both races). Medal to top three in each age division. Free T-shirts for all preregistrants. Register at Active.com or call 925-973-3200.

San Francisco Ocean Beach 5K and 6 Mile Benefits Project Open Hand. Run is on the hard-packed sand. Start at 7:30 a.m. on the beach at Great Highway and Sloat Blvd. Race-day registration opens at 6:45 a.m. $30 includes T-shirt. Winners receive a breakfast for two at Jo Ann's Cafe in SF, with other prizes for top pledge collectors and placing. 650-291-8531, PeopleEvents.org

Tuesday, July 6

Tuesday Teatime Trekkers See June 29 listing.

Friday, July 9

Critical Mass Berkeley Shut down the streets of the city on your bicycle: Don't dodge the traffic, become the traffic. In Berkeley, meet at the downtown BART station at 5:30 p.m., second Friday of every month.

Saturday, July 10

Downtown Walking Tours of Oakland See June 23 listing.

Family Sundown Safari at the Oakland Zoo See June 26 listing.

The Sierra Xtreme Adventure Racing Series The first race in this series is eight to twelve hours long, challenging the racer with bouldering, creeking, orienteering, mountain biking, and trail running at Grant Ranch in San Jose. The races are designed for beginners to intermediate racers. You can run solo ($150) or with a team of up to four members ($525). VirtuActive.com

Sunday, July 11 Monterey Bay Challenge Olympic: 1.5K swim, 40K bike, 10K run; Sprint: 0.75K swim, 20K bike, 5K run. Divisions by age group and sex, and also a Clydesdale (men over 200 lbs.) and Athena (women over 160 lbs.) division. The swim is in the Monterey Bay, parallel to the shore; the bike loop starts and ends at the Seascape Resort in Aptos; and the scenic run is on packed dirt and street (but miles four to six are on the beach on packed sand). Check-in is on Saturday, July 10. The first wave begins at 8 a.m. on Sunday. Entry fees: Olympic $90 adult, $45 under 18; sprint $70 adult, $35 under 18; relays (men, women, or coed) $120. info@bythebeachproductions.com, 831-465-6517.

Second Sunday Stroll in Crockett From 2-7 p.m., amble around downtown Crockett and enjoy galleries, antique shops, wine tastings, a barbecue, poetry readings, and live jazz. 510-459-0677.

Tuesday, July 13

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, July 14

Downtown Walking Tours of Oakland See June 23 listing.

Saturday, July 17

Donner Lake Sprint Triathlon Quarter-mile swim, six-mile bike, and two-mile run in the Sierras. Swim is a rectangular course in Donner Lake, average July temperature 64-69 degrees; bike is on a paved road with 1,000-foot total climb, an out-and-back course; run is also paved. The race starts at 7:30 a.m. at the West End Beach of Donner Lake in Truckee. $65, $85 on race day. ChangeofPace.com, 530-757-2012, fax: 530-758-1850.

Downtown Walking Tours of Oakland See June 23 listing.

East Bay Red Tail Adventure Race Put together by Big Blue, this sprint-style race is for hardcore summer-sport addicts, with $2,500 in prize money. In five to eleven hours, your team needs to complete four to six miles of kayaking, twenty-plus miles of mountain biking, a four-to-six-mile trail run, and an intense orienteering course. Big Blue requires that you have all your own gear (although limited kayak rentals are $60), and the entry fee is $150-$600. BigBlueAdventure.com/public

Kayaking the Scenic Sausalito Waterfront The Oakland Museum of California and Sea Trek (Sausalito's kayaking center) present an afternoon on the bay. There is an hour-long training session before the group heads out, so beginners are welcome. 10:00 a.m.-1:00 p.m. $80 per person, $65 if you're a CirCA member. More info: circa@museumca.org

No Attitudes Allowed Beach Doubles Volleyball Tournament Coed and men's doubles at Main and Beach streets in Santa Cruz. Just for fun. Tournaments take place monthly; nearly five hundred teams participated in 2003. $24 per team for a whole day of competitive volleyball and the opportunity to the meet players at the intermediate/advanced level of ability (no current CBVA players, please). Check-in is 8:30 a.m. on the day. Each participating player is asked to bring a nonperishable item of food for donation to People's Pantry at check-in time. Comes with a money-back guarantee if you don't have a total blast. Preregister at Active.com or call 831-464-1496.

Smells Like Guano! Freefly Competition Intermediate and advanced skydivers are eligible to participate in this four-round competition. $25 entry fee for camera and judging. Yolo County Airport, Davis. 1-800-SKYDIVE or GuanoFreefly.com

Tri for Fun #2 Seventeenth Annual 400-yard swim, 11-mile bike, 3.1-mile run at the Shadow Cliffs Regional Park in Pleasanton. The swim is in a warm lake, so no wetsuits are necessary; the biking exits the park onto pavement; and the run is on a packed fire trail. This race is for novices, grudge matches, and fun. Individual entry fee is $40; relay is $110 ($130 on race day). Check-in opens at 5:30 a.m. Registration: Active.com or 209-795-7832.

Sunday, July 18

Bike Tours of Historic Oakland 5.5-mile, slow-paced bike tour focusing on Oakland's history and architecture led by the Oakland Museum's bike-tripping docents. An alternative tour through one of Oakland's many diverse neighborhoods is also offered. Plus it's free. Meet at the 10th St. entrance at 10:00 a.m. 510-238-3514 or jcollignon@museumca.org

Coed Grass Volleyball Tournament: Sponsored by Golden Gate Sport and Social Club, this event takes place at Little Marina Green in San Francisco at Marina Boulevard and Baker. 8 a.m. check-in. 2's $60, 4's $80, 6's $120 before July 16 at 5 p.m., $70/$90/$130 after. Register online at PlayintheBay.com

Donner Lake International Triathlon 1.5K swim, 40K bike, 6.5-mile run in the Sierras. Swim is a rectangular course in Donner Lake, average July temperature 64-69 degrees; bike is on a paved road, climbing Donner Summit (a 1,200-foot climb), an out-and-back course; run is also paved. 7:30 a.m. at the West End Beach of Donner Lake in Truckee. Entry fee is $95 individual, $130 relay team, $115/$150 respectively on race day. ChangeofPace.com, 530-757-2012, fax: 530-758-1850.

Second Annual Jail Break Run 5K on flat figure-8 course, 10K on primarily flat course with one grueling hill that is the same hill the Alameda County SWAT team trains on. Registration fee $20 before July 15, $25 day of event. One-mile and half-mile races for kids under eight; entry fee $5 (includes a finisher's medal). Race starts 8 a.m. at Alameda Country Sheriff's Training Center, 6289 Broder Blvd., Dublin, OnYourMarkEvents.com

Monday, July 19

Save Our Sports Golf Classic The West Contra Costa Unified School District is hosting this golf event at the Richmond Country Club. Registration begins at 8:00 a.m. with a shotgun start at 10:00 a.m.. The fee is $250 per person and all profits go to restoring the programs recently cut at schools in the district. Included in the fee is a full day of activities, food, and fun, with an ongoing putting contest, golf clinic, continental breakfast, barbecue luncheon, raffle prizes, auction, gift bag, and an awards dinner. 818-995-6545 or 510-620-2206. Register online at www.wccusd.k12.ca.us/

Tuesday, July 20

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, July 21

Downtown Walking Tours of Oakland See June 23 listing.

Thursday, July 22

Knobbers Kids can play old-fashioned games that show them what life was like as a 1870s-era knobber, a child who helped coal miners underground. 3:30-5 p.m.. $6, registration required. Black Diamond Mines, Antioch, 925-757-2620.

Saturday, July 24

Aqua Challenge Racers can join a two-mile, one-mile, or half-mile swim. Preregistered entry is $25, race-day is $30. Entry fee includes free T-shirts, award ceremony, refreshments, and raffle. Parking is $4. Make check payable to On Your Mark, P.O. Box 1199, Arnold, CA 95223-1199. Swim caps are required and will be provided. Certified lifeguards will be laid out thickly along swimway. Nonwetsuit and wetsuit divisions (male and female). Race-day check-in at 7:00 a.m. Race starts at 8:30 a.m. Lake Del Valle Regional Park Swim Beach, Livermore. $4 for parking; carpooling recommended. 209-795-7832, OnYourMarkEvents.com

Downtown Walking Tours of Oakland See June 23 listing.

Family Sundown Safari at the Oakland Zoo See June 26 listing.

Tahoe Pro-Am Disc Golf Open Fund-rraiser for the Hepatitis C Foundation. At Bijou, two rounds of 27 holes each on Saturday, one round of 27 holes on Sunday, and the final 9. Pro, master, and grandmaster entry fee $62; advanced and advanced master $52; recreational and juniors $32. Add $5 if you're not a PDGA member. Women's divisions at each level. $5 for lunch each day. Closest to the pin contests, raffle, loser events. Check-in at 7 a.m., meeting at 8 a.m., start at 8:30 a.m. P.O. Box 9903, South Lake Tahoe, CA 96158. Russ Wey 530-542-3432, bijoudiscgolf@cs.com

Sunday, July 25

Catfish Open Water Swim This event is two races -- a 1.2-mile swim and a 2.4-mile swim -- in Lexington Reservoir in Los Gatos. The reservoir is ideal for competition, offering clean water, warm sun, and a beach party atmosphere. Preregistration before July 11 is $45, $55 after. Registration includes T-shirt, swim cap, race bags, and free food. There is no parking, so park at Los Gatos High School and take a free shuttle. Race packet pickup starts at 7 a.m. The 1.2-mile begins at 8:00 a.m., and the 2.4-mile at 8:45 a.m.. Register at JAProductions.com or 888-300-RACE.

DSE Memorial Run 4.5 M Kennedy Drive & 36th Ave., Golden Gate Park, San Francisco. $2/$5 nonmembers. DSERunners.com, 415-978-0837.

Tuesday, July 27

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, July 28

Downtown Walking Tours of Oakland See June 23 listing.

Friday, July 30

Critical Mass in SF See June 25 listing.

Night Dives Skydance Skydiving offers night sky dives one hour after sunset, once a month during the full moon. Participants must have a current, valid USPA B license or higher. One-hour briefing before diving. Yolo County Airport at Davis. 1-800-SKYDIVE, Skydance.net

Saturday, July 31

Berkeley Kite Fest 11:00 a.m.-5:00 p.m. Free kite-making sessions and kite-flying lessons, giant animal kites, multitiered kites, and feats of spectacular genius by pros. Cesar Chavez Park at the Berkeley Marina. Contact fest@highlinekites.com. HighlineKites.com or 510-235-KITE.

Downtown Walking Tours of Oakland See June 23 listing.

Frying Pan Pro/Am Disc Golf Tournament A two-day event at the Oak Grove Regional Park in Stockton (intersection of I-5 and Eight Mile Rd.). Awards ceremony, contest results (CTP, putting, etc.), and a raffle will be held immediately after the last round on Sunday. Lunch is $5 on Saturday. The first eighty people registered for the amateur division receive players' packages. Check-in on Saturday is 8 a.m., players' meeting at 9:30 a.m., tee off at 10 a.m. Entry fees range from $70 for men's master to $30 for junior division. Call Michael Wallace for details at 209-712-7002; print the flyer at www.deltawindjammers.com. PDGA sanctioned, "B' tier.

Sunday, August 1 Alameda Run for the Parks 10K/2M 8:30 a.m. at Alameda's South Shore Shopping Center. Both races are flat, fast loops. Early entry (postmarked by July 21) for $20; race day $25 (registration 7-8:15 a.m.). Lots of refreshments. Register online at Active.com, or at Run for the Parks, 1327 Oak St., Alameda, CA 94501. Info: 510-747-7529.

Berkeley Kite Fest See July 31 listing.

Eleventh Annual San Francisco Chronicle Tour de Peninsula The Bay Area's largest cycling event is a 33-mile tour of the SF peninsula, sponsored by the Chronicle. (Five rest stops; 17- and 21-mile shortcuts.) All proceeds benefit the San Mateo County Parks Foundation. Start at Sequoia HS in Redwood City, at Broadway & El Camino streets. $30 per adult by mail if postmarked by July 23, $31 online registration until 11 p.m. on July 29, $35 day of event (6:30-8:30 a.m.) $15/$16/$20 under sixteen. E-mail info@rhodyco.com, call 415-759-2690, or visit Rhodyco.com

Skyline 50K Endurance Run From Lake Chabot to Skyline Gate through East Bay Regional Parks over hilly but scenic loop course with dirt trails. Early fee $50; race day $65. Race-day registration and race-number pick-up from 5:45 a.m. to 6:45 a.m. A PA/USATF Grand Prix race sponsored by BAUR and EBS. Post-race banquet. E-mail skyline50k@comcast.net, visit Skyline50k.us, or call 510-247-9774.

Tuesday, August 3

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, August 4

Downtown Walking Tours of Oakland See June 23 listing.

Friday, August 6 Sixth Annual Run for the Arts 5K Run/Walk Entertainment is provided throughout the entire course: music, art, dance, costumed characters, and interactive booths. Fee of $25 (adults) and $15 (under twelve) includes T-shirt, parking, and post-race refreshments. 6:30 p.m. start for kids' races, 7 p.m. start for 5K at Crocker Park, across from the Crocker Arts Museum, 211 O Street, Sacramento. Contact goldmedal@accessbee.com; RacefortheArts.com; Sally Rice 916-933-4056.

Saturday, August 7 Downtown Walking Tours of Oakland See June 23 listing.

Family Sundown Safari at the Oakland Zoo See June 26 listing.

Sunday, August 8

Alcatraz XXIV Escape from the Rock 1.5-mile swim, 2.5-mile run, 13-mile bike, 7.5-mile run. $200 per individual for complete triathlon, $85 per individual for the swim only. Register early or miss out; for everyone who didn't register in time for the Alcatraz Sharkfest, the swim-only is for you. 7:00 a.m. at Alcatraz Island. 415-868-1829. Envirosports.com

Gift of Life 5K and Concourse Mile Run/Walk: San Francisco Benefits Gift of Life Transplant House. Starts 8:30 a.m. at JFK Drive near Conservatory of Flowers, Golden Gate Park. $25; $30 if both events. SASE: People Events, 528 Larch Ave., South San Francisco, CA 94080; 650-291-8531; PeopleEvents.org

Moonlight on the Mountain Dine on Mount Diablo under the full moon. For $150 enjoy a catered dinner with hors d'oeuvres, drinks, music, live and silent auctions, and a great view. Proceeds go to Save Mount Diablo. For reservations call 925-947-3535. SaveMountDiablo.org

Sandman Triathlon: Seacliff State Beach Near Aptos. Half-mile swim, fifteen-mile bike on B-loop, 4.2-mile run, out and back on beach. 9 a.m. start. Fees ($60 individual/$100 team) include T-shirt and race bag; no race-day registration, limit 500. Must be USAT member or purchase a one-day membership. Preregister online at Active.com; more info at SCSLA.org. E-mail alay027@yahoo.com or call 831-238-2863.

Second Sunday Stroll in Crockett See July 11 listing.

Tuesday, August 10

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, August 11

Downtown Walking Tours of Oakland See June 23 listing.

Friday, August 13 Critical Mass in Berkeley See July 9 listing.

Saturday, August 14

Dammit Run: Five Miles Starts 8:30 a.m. at Los Gatos HS Track; rough, rocky, dirt trails, loop paved, hills. $30 with T-shirt ($10 without), $40 ($20 without) after August 12. Bruce Springbett, 220 Oak Meadow Dr., Los Gatos, 95032; 408-354-7365.

Downtown Walking Tours of Oakland See June 23 listing.

Folsom Mountain Bike Sprint Triathlon Five-hundred-yard swim, ten-mile bike, 3.1-mile run. Swim is a loop in Lake Natoma; mountain bike and run are on hilly dirt paths and fire trails. Awards three-deep in every age group (starting at 29 and under and going to seventy and up), for every level of experience. Postrace party. Register soon, as there are only four hundred spots available. Preregistration before July 10 is $70, $80 after; no relays. Packet pick-up and race-day registration starts at 6 a.m.; first wave begins race at 8 a.m.. Nimbus Flats State Park in Folsom, off Highway 50. JAProductions.com, 888-300-RACE.

Sunday, August 15

Bike Tours of Historic Oakland See July 18 listing.

Davis Kids' Triathlon For ages four to seventeen, a unique and safe event to introduce kids to triathlon events. Races designed differently for every age group; six and under do a 25-yard swim, one-mile bike, and quarter-mile run. Fifteen to seventeen do a 200-yard swim, four-mile bike, and two-mile run. First heat (fifteen to seventeen group) starts at 8 a.m.; at the UC Davis Schaal Aquatic Center. Entry fee $30 per child, $25 per additional sibling; includes a T-shirt, water bottle, a kids' meal at Chevy's in Dixon, and a finisher's medal. Register at ChangeofPace.com or 530-757-2012.

Folsom International Triathlon Racers from all over the world are invited to race the 1.5K swim, 40K bike, and 10K run on a flat and fast course. Entertainment for spectators and nonracers includes a climbing wall, live music, booths, catered food, and humorous announcers. Awards will be given for top three male and female teams and overall club top score; a beer and BBQ party will be put on by J&A Productions for the winning club. Each Tri-Club team member must register online for the Nor-Cal Tri-Club Championships. Register before July 10: $95 individual racer, $105 relay team; after July 10, $105/$150. No race-day registration; pick up your race packet on August 14. Race starts at 7:00 a.m. at Lake Natoma, Folsom. Nimbus Flats, California State Park. 866-300-RACE, JAProductions.com

Howell Mountain (Biking) Challenge Ten-Mile Loop/Pacific Union College. Check-in 8 a.m. and 10 a.m.. $35 registration after August 7, $30 before. One-day NORBA license sold race day for $5; pro and expert racers must buy a year's license for $50. Race begins 10:30 a.m. Course is hilly, with smooth-to-medium-rough trails, service roads, double- and single-track, lots of trees. $120 purse to first male and female finisher. Online registration on Active.com. 707-965-6346, mlhellie@puc.edu.

Tuesday, August 17

Tuesday Teatime Trekkers See June 29 listing. Wednesday, August 18

Downtown Walking Tours of Oakland See June 23 listing.

Thursday, August 19

Knobbers See July 22 listing.

Saturday, August 21

Downtown Walking Tours of Oakland See June 23 listing.

Family Sundown Safari at the Oakland Zoo See June 26 listing.

Fifteenth Annual Angel Island: 12K, 25K Course consists of a very hilly loop trail run circumnavigating Angel Island with panoramic vistas of San Francisco Bay and the Golden Gate. No dogs. $28 entry by August 17, $33 after. No race-day entry. Charter ferry from Tiburon departs at 8:30 a.m. Ferry ticket included in entry fee. Race starts at 9 a.m. Contact info@envirosports.com; 415-868-1829; Envirosports.com. Register early: race could fill before race day.

No Attitudes Allowed Beach Doubles Volleyball Tournament See July 17 listing.

San Francisco Safari Disc Golf Tournament and Games Festival A two-day, three-course tournament. Played on courses Safari East and Safari West, temporary eighteen-hole courses, and Marx Meadow, the new permanent course in Golden Gate Park (twelve permanent baskets, six temporary). Ace contest, CTP, skins match, team tournament, and other side activities. Volunteers are needed to help set up the 49 temporary baskets and will receive free event merchandise. Registration is $90 pro, $80 pro master, $70 pro women and grand master, $60 amateur I, $50 amateur II, $55 amateur master, $40 amateur women; add $5 if you're not a PDGA member. Registration at 8 a.m., tee off at 9 a.m. Contact: Edwin Dissosway, 510-769-9797, SFDiscGolf.net

Tri for Fun #3 See July 17 listing.

Sunday, August 22

Alcatraz Challenge Aquathlon 24th Annual 1.5-mile straight swim from Alcatraz to Crissy Field, seven-mile run from Crissy Field over the Golden Gate Bridge, then return. Relay or go it solo. Register before July 4 and it's $99 for the aquathlon, $124 for a relay, and $79 just for the swim. Race starts at 8:00 a.m.. 650-359-3773. OceanSwims.com/us/alcatraz04.html

Mermaid Triathlon and Duathlon for Women Triathlon: 0.25-mile swim, 11-mile bike, 2.5-mile run; duathlon: 1.5-mile run, 11-mile bike, 2.5-mile run. Swim is parallel to the beach in Monterey Bay; the bike is a loop on mostly easy, rolling hills (paved); and the run is on both packed dirt and pavement. $70 individual (register before August 1), $120 three-person relay, $35 individual under eighteen; no relays in the duathlon, $40 individual, $20 under 18. Fee includes T-shirt and postrace party. At the Monterey Bay Academy in Santa Cruz. Register at MermaidTriathlon.com, 831-465-6517, or info@bythebeachproductions.com

TriOne Triathlon Two courses: The sprint or the international (longer and slower) course. The sprint is a 0.75K swim, 13K bike, 5K run; the international (which can also be done as a relay) is a 1.5K swim, 40K bike, 10K run. Registration fees are $65 individual for the sprint, $85 individual for the international, and $135 team for the international relay. You must have a valid USA Triathlon number or pay a $9 race-day fee. In Alameda at the Harbor Bay Isle Ferry Landing. 7:00 a.m.. There will be a party afterwards. Proceeds benefit the Bay Area ALS Association and the Robert Packard Center for ALS Research. info@trione.org or TriOne.org/homeframes.htm

Tuesday, August 24

DSE San Bruno Mountain: 1/2 Marathon, 5K Handicap Half-marathon starts 8:30 a.m., 5K at 9:30 a.m. at San Bruno Mountain State Park in Daly City. Spectacular views of the entire Bay Area; race is on a dirt track, very low-key. $10 and $5 respectively, $15 and $5 on race day. Contact George Rehmet at rehmet@earthlink.net or 650-992-9120; DSERunners.com

Tuesday Teatime Trekkers See June 29 listing.

Wednesday, August 25 Downtown Walking Tours of Oakland See June 23 listing.

Friday, August 27 Critical Mass in SF See June 25 listing.

Night Dives See July 30 listing.

Saturday, August 28 Downtown Walking Tours of Oakland See June 23 listing.

UC Santa Cruz Challenge Four Miles Women's start, 9 a.m.; men's, 9:45 a.m. Fee of $10/$15 late registration. Beautiful cross-country course. Starts on large grass field (UC Santa Cruz East Field House) with views of Monterey Bay, rolling dirt trails through redwood trees and meadows. Some challenging hills with finish on same grassy field. Contact Arturo Rodriguez at arturorod@prodigy.net or 831-471-9444. Wednesday, September 1 Downtown Walking Tours of Oakland See June 23 listing.

Saturday, September 4

Boothill Half Marathon or 10K in Pescadero Start 9 a.m. at Native Sons Hall (fourteen miles south of Half Moon Bay). Mostly an out-and-back course, mainly flat with a roller-coaster area from miles three to nine. Race numbers NOT mailed; pick them up on race day. $20, $25 race day; includes T-shirt & age division awards. info@skyhighevents.com; 510-223-5778; TheSchedule.com

Downtown Walking Tours of Oakland See June 23 listing.

Historic Train Fair At Ardenwood Historic Farm this weekend, the authentic 1891 Best Steam Engine will be running, as will the rail-riding stories coming out of the hobo camp. There will be model railroads, equipment displays, and a working handcar to take rides on. 10 a.m.-4 p.m. Turn right off Ardenwood Blvd., 510-796-0663.

Sunday, September 5

DSE Potrero Hill 4M 9 a.m. at 17th and Arkansas sts. in San Francisco. $2, $5 nonmembers; race-day entry permitted. DSERunners.com or 415-978-0837.

Twelfth Annual Bear Valley Triathlon Race includes a 600-yard swim, a 10.5-mile bike ride, and a 3.4-mile run. Post-race barbecue at the Tamarack Lodge on Highway 4. Nonparticipants can attend the barbecue for $7. Race starts at 10:00 a.m. Check-in and race-day registration opens 8:30 a.m. Bear Lake in Bear Valley Village. OnYourMarkEvents.com

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