The park is riddled with roch gardens and large obstacles. most are rideable by fairly novice riders, but there are also some pretty gnarly stuff to ride. from the first right parking lot, a good route is trail 7 to the end of the fittness trail, pass the south lookout platform and into the back parking lot. from there go up the walking trail (trail 1) and go straight until you get to trail 2 and go right. from there ride till you pass the north lookout and the beggining of the new trail 4 is there( 4 is technical in some parts, but really fun) then at the bottom of 4 hop on trail 5 and either get off the connecter or go around the 3/4 mile loop or so back to the parking lot. this is my favorite loop. there are plenty of ways to get around the park, if you take the back trails (8 and 9 most notably) get ready to climb excessively are hike-a-bike; it can get pretty intense back there.
from route 30, take the mt zion road exit and go north on route 24. pass the york galleria mall ( it will be on the left side) and go up a pretty large hill. right after the top of the hill there is a hidden road on the right. It is named Deininger road, turn right on deininger and faollow it straight back till you are in the park and see the first two lots to the right and left of you.
http://www.singletracks.com/item.php?c=1&i=4174