Santa Cruz Mountains Trail Association - Conducts hikes and trail maintenance in the San Francisco Bay area. Includes list of activities and membership information. - http://www.scmta-trails.org/
Orinda Hiking Club - History of organization, membership information, hike schedule, and photos. Based in San Francisco Bay Area. - http://www.orindahiking.org/
Desert Trails Hiking Club - Leads hikes in and around the Coachella Valley. Includes newsletter, calendar of events, and membership application. Based in Palm Desert. - http://www.deserttrailshiking.com/
Coastwalk - Vision is to complete the California Coastal Trail, which will stretch from Oregon to the Mexican border. Includes history of organization and events schedule. Based in Sebastopol. - http://www.coastwalk.org/
Coachella Valley Hiking Club - Mission statement, schedule of upcoming hikes, trail descriptions, and photos from recent hikes. Based in Palm Springs. - http://www.cvhikingclub.net/
San Gabriel Mountains Trailbuilders - All-volunteer group dedicated to constructing and maintaining trails in the Angeles National Forest. Find information on projects, photos, links, and contacts. - http://www.sgmtrailbuilders.org/
Stanford Outing Club - Includes information about their past and future trips, photos, and driving directions to selected trailheads. Based in Palo Alto. - http://www.stanford.edu/group/outing/