While Chino Hills State Park has existed for a couple of decades, or more, the new small campground was just opened in May of 2005. Maximum length for RV's is 28 feet. All spots are back in. In a few years the trees they have planted will provide nice shade. The 24 spots are all paved and pretty level, and are terraced up the side of a hill, so everyone gets a view! The restrooms and showers are brand new and immaculate! Lot's of hiking, mountain biking trails. The park is about 12,000 acres with lots of Oak trees. When you enter the park you will drive about 3 miles on a narrow dirt road until you reach the center of the park where everything is paved. Very helpful Rangers on duty and easy to find. Very quiet. This little campground is one of the best kept secrets in the area. You will feel like you are 200 miles from anywhere, when in fact you are less than 4 miles from civilization! You can hear the coyotes at night. Get's the ocean breezes from Orange County. We camped here in a Motorhome.