The Mount Diablo State Park is a state park and recreation area in Clayton, California. It features Mount Diablo and its surrounding area.

Covering around twenty thousand acres of area, the Mount Diablo State Park is said to be the first public open space of a complex. It is composed of 38 preserves with about 90,000 acres of privately preserved lands surrounding the park proper.

Due to its size, there are tons to see and do at the Mount Diablo State Park. Camping, picnicking, hiking, and wildlife viewing are some of the most popular activities. Folks can also explore around and enjoy the boardwalk with its interpretive stations as well as climb the summit building and enjoy spectacular views at its rood promenade and beacon tower.