The East Bay Regional Park District began acquiring land for Black Diamond Mines Regional Preserve in the early 1970s.
Coyote Hills Regional Park was dedicated in 1967.
Diablo Foothills is an imposing gateway to the beautiful parklands of Mt Diablo State Park and Walnut Creek Open Space.
Within Diablo Foothills Regional Park is the Castle Rock Recreation Area which is located in a scenic canyon along Pine Creek.