Located right off 280, Rancho San Antonio Open Space Preserve is a 3,988-acre park offering visitors a unique experience with a sampling of diverse environments, interesting cultural history, and a variety of activities. 

The preserve’s extensive 24 miles of trails are available for exploration, whether one chooses to hike, bike, or horseback ride. Trails can be combined to form loops of different lengths and difficulties including the 3-mile Wildcat Loop Trail and the 4-mile Black Mountain Trail. A highlight of the preserve is Deer Hollow Farm, a working farm with a cow, pigs, goats, sheep, and chickens, along with an organic garden and numerous turn-of-the-century ranch buildings. An additional attraction is the restored Grant Cabin, furnished to represent living conditions in the late 1800s.

Rancho San Antonio Open Space Preserve is open half an hour before sunrise to half an hour after sunset. There are several parking lots, including one designated for equestrian trailers. The trailhead for the preserve is located adjacent to the 85-car parking area in the northwest lot.