MOOMOO hill features 5 miles of hiking trails near Walnut Creek, CA.
start at lime ridge entrance, look towards the tallest hill there will be two trails one on the left one on the right sort of in the middle the left trail has staris and gates it is easier to go up that one. Pick a trail and bomb it. WARNING you go very fast a friend of mine ate it going 30 down it and got a concussion.
http://www.tripleblaze.com/trail.php?c=3&i=688