The nonprofit Yosemite Conservancy (tel. 209/379-2317; www.yosemiteconsercancy.org) offers dozens of Outdoor Adventures, covering subjects from backpacking to natural history, to photography. Most of the programs are multiday, with charges of about $100 per person per day (not including lodging and meals), and often include hikes or backpacking trips.
Part of concessionaire DNC Parks & Resorts at Yosemite, Yosemite Mountaineering (tel. 209/372-8344; www.yosemitemountaineering.com) offers a variety of guided climbing and backpacking trips.
Southern Yosemite Mountain Guides, based in Santa Cruz (tel. 800/231-4575; www.symg.com), offers hiking, backpacking, fishing, and rock-climbing trips. Trips last from a day to over a week; prices run about $150 to $200 a day.
Austin-Lehman Adventures, based in Billings, Montana (tel. 800/575-1540; www.austinlehman.com), offers guided family-oriented multiday hiking tours in Yosemite. Five-night trips run about $1,900 to $2,500 per person, lodging included.
Backroads, based in Berkeley (tel. 800/462-2848 or 510/527-1555; www.backroads.com), offers a variety of guided biking and hiking tours in the Yosemite area. Rates are about $2,500 to $3,500 per person for 6 days.
The World Outdoors, based in Boulder, Colorado (tel. 800/488-8483 or 303/413-0938; www.theworldoutdoors.com), offers a variety of trips, including multisport adventures that feature hiking and biking in Yosemite. Rates range from $1,900 to $2,600 per person for 6 days.
Additionally, the Evergreen Lodge has excellent in-house recreation programs that include guided trips in and around the park.