Deep in a valley framed by oak-covered hills, with sailboats and sailboards skimming over its waters, Del Valle is like a lakeside resort only 10 miles south of Livermore.

The centerpiece of the park is a lake five miles long with a variety of water-oriented recreation, from swimming to windsurfing and boating, surrounded by 4,395 acres of beautiful land for hiking, horseback riding, and nature study. Del Valle also is the eastern gateway to the Ohlone Wilderness Trail, 28 miles of scenic backcountry trail.

Del Valle offers two swimming beaches with lifeguards on duty during posted periods. Year-round swimming is allowed, but only north of the boat ramp and at the swimmer's own risk.