Please abide by the boundary signs and do not trespass onto Water Department lands that are not part of the lease arrangement. Also, swimming is not allowed in Alameda Creek in the Little Yosemite area. For the past century, however, the land known today as Sunol Regional Wilderness was used almost exclusively as ranch land. Great boulders of greenstone, schist and metachert indicate a turbulent past. The massive basalt outcrop at Indian Joe Cave Rocks provides sport and challenge to rock climbers.
Coast live oaks abound along with valley and blue oak, elderberry, madrone and gray pine.
Spring brings wildflowers, including California poppies, mustard, goldfields and lupines, which carpet vast areas in yellow, orange and blue. A wildflower identification kit may be checked out at the Visitor Center. Observant campers and hikers may notice raccoons, skunks and blacktail deer. Mountain lions are uncommon, but are occasionally sighted. The acorn woodpecker, black phoebe, titmouse, turkey vulture and yellow-billed magpie are commonly sighted.