If you're looking for a fun and short ride in Peachtree city go here.
Go to Baseball Soccer Complex (BSC). Turn into SOCCER fields entrance and drive down to the last parking spot for the upper fields. You will see cedar spread on the ground leading to the woods. There is the start(or end) of the trail. End comes out about 20 yds before.
http://www.singletracks.com/item.php?c=1&i=3762