What was once military property, now constitutes a great and convenient getaway for hikers, bikers, and climbers and birders. There are lots of hiking trails. Local outdoor businesses hold compass reading as well as rock climbing classes here. There is a lovely Visitor's Center which has lovely views of the area, maps of the park, a library and rooms for nature classes. Great place for a quick getaway from traffic and trails to fit the ability of most hikers. And even in summer the San Diego River flows over the lovely 19th century brick dam.