This is a great 4 mile loop that is challenging and should take less than an hour.
Once you pull into the parking lot you will see a bridge. Cross this bridge on your bike and go left. Just follow this trail and it will loop back around to the parking lot. If you want the trail can be broken up with the connectors. The trail is decently marked so it should be fairly easy to stay on the trail. This trail is challenging so make sure that you are comfortable on your bike.