There are several different campground areas in the Chino Hills State Park. As a larger group of campers, we ended up in the horsecamp which we naturally shared with the people with horses.
There was plenty of room for the energy-filled boys to run around. There were several horseback riders around enjoying the trails. The campsite where we stayed at was located at: 33°55'15.83"N 117°42'3.88"W
The amenities for the campgrounds will different depending upon what site you are camping.
Chino Hills State Park Web site
Other Nearby Waymarks:
Telegraph Canyon Windmill