The Mojave Group of the Sierra Club regularly organizes field trips to interesting spots such as Red Mountain, Silverwood Lake, and the San Gabriel Mountains. The San Gorgonio Sierra Club chapter also conducts desert excursions.
Sierra Club (3345 Wilshire Blvd., Suite 508, Los Angeles, 90010. 213/387-4287; 909/686-6112 for San Gorgonio chapter. www.sierraclub.com).