The towering rock spires in this patch of Steinbeck country are the result of peculiar geologic forces. Over the eons, the movement of the land along the San Andreas fault brought a piece of the volcano up into these parts. Erosion did its work, and what remains are the hundreds of odd rock formations that reach for the sky. Climbers, of course.
Pinnacles is THE natural climbing spot for rockheads in the Bay Area on the weekends.
But there's plenty for the campers, too. Ascend rigorous trails or hike more gentle terrain and explore caves. Try the High Peaks Trail or the Juniper Canyon Trail . Balconies Cave is a winner, too. But beware of the poison oak.