These trails are maintained by the Land Trust of North Alabama. The recommended bike route from the trailhead is:<br />
Bill & Marion Certain Trail, right on Sugar Tree Trail, left on Varndoe Trail, left on Bill & Marion Certain Trail (views of Big Cove and Hampton Cove), left on Power Line Trail (views of Bailey Cove, Tennessee River, Redstone Arsenal, and Marshall Space Flight Center), right on West Bluff Trail, and left on Bill & Marion Certain Trail back to trailhead. This route is about 5 miles with a wide range of difficulty and plenty of scenic views at any time of the year.
Main gravel parking area is off of Cecil Ashburn Drive at Blevins Gap between Huntsville and Green mountains.
http://www.singletracks.com/item.php?c=1&i=5893