Several trails have been developed for day hikers, some of which are strenuous. Primarily in March and April, a wide variety of wildflowers is on display, except in years of extreme drought. The trails provide views of the surrounding hills and valleys on clear days. The San Andreas Fault is visible from some vantages along the trails. The park includes a well-known hiking portion known among enthusiasts simply as "The Pig Fence". This portion of South Wilderness Trail is a challenging stretch of strenuous hiking that at times requires use of the fence, erected to prevent feral pigs from entering the park, to help oneself to climb the steeply pitched trail. Other trails include lush wildflower-accented views along flat stream beds, trails that bring one into beautiful caves, and trails that involve high vistas of the Pinnacle formations.