flat firetrail mostly. some hidden singletrack can be seen from the entrance, but i can never find how to get to it. pretty flat and unchallenging, but a good place hike or fart around. if you climb up the rocks in castle rock you can find the bong cave and climb inside there
map: http://www.ebparks.org/files/EBRPD_files/brochure/dfoothills_map.pdf
from 680 take ygnacio valley road, then right on oak grove road and you will start seeing signs<br />
http://www.singletracks.com/item.php?c=1&i=2491