The trail is almost all singletrack (depending on where you start) and takes you along a steep edge overlooking the TN River. There are some decent climbs for the area and the trail is fairly rocky and is very well marked with signage and highlights. This is the home of an annual MTB race and his groomed by a small but dedicated group of riders out of Jackson and the surrounding area.
A little less than halfway between Nashville and Memphis, head south of I40 about 30 minutes to 412 which runs E-W. Nestled on the east side of the TN river lies Mousetail State Park. Enter the park and go to the park HQ for a map. There are a couple of places from which to start the ride.
http://www.singletracks.com/item.php?c=1&i=3565