Start your ride up the dirt road (Shadow mountain road) for about 5 miles - not an exceptionally tough climb and the views of the Teton range rising up over the valley and the wildflowers make the scenery absolutely spectacular. (There is plenty of camping up this road also). Once at the top look for the singletrack to your left. This is a fast fun - not very techical singletrack that will drop you just to the north of the original parking lot. There is a fire tower somewhere on top of Shadow Mountain - I just didn't happen to look for it.