There are 30 miles of fantastic hiking – when it's not blazingly hot. On clear days, Bald Mountain has drop-dead views to the sea, while the Brushy Peaks Trail peers into Napa Valley. Both are moderately strenuous; plan on a three-hour round-trip. Bikes and horses can use perimeter trails seasonally.
There's a small but well-stocked visitor center.
The wildfires of 2017 affected this park, but it's recovering well and is back open.