Non-profit organization to protect and improve hiking and riding trails in Bonita. Includes trail maps, events calendar, and volunteer information.

Group of trailrunners, hikers, cyclists, backpackers, snowshoers, skiers and climbers organize trips in and out of state and offer guide services and tours. (Pittsburg)

Organized for the gay and lesbian community, activities include camping, hiking, rafting, skiing, kayaking, sailing and social events. Includes events calendar and list of local chapters. (southern California)

Activities include biking, kayaking, climbing, and hiking. Offers mailing list, trip reports, and photos. (San Francisco Bay area)

Membership restricted to people under 40. Activities include hiking, camping, skiing, climbing, rafting, sky-diving, and SCUBA. (Los Angeles)

University of California at San Francisco's club participates in backpacking, kayaking, skiing, and rafting, in addition to working on first aid, and teambuilding. Organization rents equipment and is open to the public. (San Francisco)

Group rents out climbing and backpacking gear and has weekly meetings and quarterly trips. Membership restricted to Stanford students, faculty, and staff. (Stanford University, Palo Alto)