This regional park is between the city and Chino Hills State park. Activities include a short ~ 1 mile hike to a redwood grove or much longer hikes into the state park. Crowded on weekends with parties and children, but deserted weekday evenings. When the crowds leave you might see some of the local wildlife (deer, bobcat, coyote, racoon, etc.). Excellent for pinics, excercise, & hiking. Vehicle entrance fee; closes (and most beautiful) at dusk.