A 400-mile hiking, biking, and equestrian trail connecting parks and preserved open spaces along the ridgelines surrounding California's San Francisco Bay. www.ridgetrail.org/trail
Club featuring weekday and weekend adventures and socializing opportunities. Membership information, events calendar, photo album, contact details and related local links. www.absoluteadv.com
A resource for parents and kids to find activities that keep kids active. Sports such as basketball, volleyball, surfing, swimming, golf, arts and theater, camps, clinics, organizations, in and around the Bay Area. www.sfgokids.com
Cooperative sea kayaking club. Providing a forum for people to meet other paddlers, generate ideas for new trips, and promote safe sea kayaking. www.bask.org/frame.html
Group of knife collectors and making of custom knives. Includes forum, membership, and meeting information. Based in Northern California. www.bakca.org
Organization of people who enjoy creating and wearing costumes. Calendar of themed events, photographs of past events, membership information, extensive directory of costuming resources. www.gbacg.org
Offers men and women leagues featuring seasoned professionals and college players. Provides team and player profiles, archive, scores and highlights, and links. www.sanfranciscoproam.com
Bay area trail running and ultra training. Contains trail maps, topologies, photos, descriptions, as well as contact details and related links. www.durt.org
Home brewing club. Includes meeting schedule, recipes, newsletters, information about equipment rental and their yeast bank, and membership information. www.wortsofwisdom.org
Serves multisport athletes of all ages and abilities. Offers information on workouts, training programs, and racing events, as well as photos and contact details. www.ggtc.org
Tennis partner locator. Search for players based on simple search criteria like location, gender, and skill-level. Also includes message board, and instructor listing. www.letsplaytennis.org
Club features various outdoor activities weekly, including hiking, skiing, and kayaking. Calendar, membership information, photo gallery, and contact details. sfoac.com
Serves the East Bay Regional Park District. Members assist in preserving the safety of visitors and of park resources. Information about programs, trails, park lands, events, and membership. www.parkpatrol.org
Annual event featuring a full day of convention-style games including strategy games, abstract boardgames, wargames, and collectible and non-collectible cardgames. Directions, mail list, and contact details. davekohr.best.vwh.net/gamesday