One is eleven miles, a roundtrip to the Chalone Peak that gives great looks at the rock formations, and an amazing view at the top. The Geology Hike and Balconies Trail are good learning experiences. Wherever you go, take a flashlight and water. People sometimes get lost. Earthquakes, as the volcano rides the San Andreas Fault, certainly happen.
Some trails are only for experienced hikers.
Some areas were flooded. Not all trails have been restored, and remain unopened. Sunlight on the rocks makes a constantly changing color show. There are two campgrounds near the park entrance. The private campground has 100 spaces, some with electricity,pool, store, flush toilets and showers.