The preserve is open for hiking, horseback riding and bicycling (with some restrictions). The climate at the preserve is arid and temperatures commonly exceed 100 degrees Fahrenheit in the summer months. Be prepared for the summer heat: use sunscreen, wear a hat and loose-fitting clothing, wear good hiking shoes. Drinking water is available at the staging area. Be sure to carry plenty of water with you during your hike.
From I-680, exit at Ygnacio Valley Road. Proceed on Ygnacio Valley Road to Clayton Road in Concord and turn right (east). Clayton Road becomes Marsh Creek Road in Clayton. Proceed east on Marsh Creek Road, past Deer Valley Road, until you reach the preserve staging area on your right.
http://www.tripleblaze.com/trail.php?c=3&i=7198