Iron Hills Trail (Red Top Mtn. State Park) features 3 miles of hiking trails near Cartersville, GA.
From Atlanta, take I-75 North, Exit 286 (I think)--just follow the "Red Top Mountain State Park" signs from the Interstate. Once in the park, stop at the office, pick up a map.
http://www.tripleblaze.com/trail.php?c=3&i=956