BicycleTrails in San Ramon

Las Trampas Wilderness Regional Preserve ahs more than 5,700 acres of wilderness and an expanded trail system that for hikers, bicycles and horseback riders. This park is home to the Las Trampas and Bollinger faults and their related geological formations including remnants of ancient shoreline, fossil-bearing rock layers, and a volcanic tuff. The Bollinger staging area has a chemical toilet and picnic site. There is no water within the park.