8+ miles of mountain bike trails near the lake.
Take I-40 east out of Nashville and exit for Hwy 265/45/Old Hickory Rd. Turn left (north) then right on Andrew Jackson Pkwy. This turns into Saundersville Rd. Just after you cross over Old Hickory Lake, look for the Shutes Branch Recreation area on the right.
http://www.singletracks.com/item.php?c=1&i=4699