Paved concrete path with wide wooden bridges lead you to hiking trails running throughout the park. Hike around ruins from the old waterworks, get up close to the creek, and discover granite outcroppings.
"From I-85 south, exit left on to North Druid Hills Rd. Proceed to Clairmont Rd and make a right. Then make a left onto Mason Mill Rd. From there go to the bottom of the hill untill u see an old, muddy road that leads to some rail road tracks. Cross the tracks and and down a little path goes past some ruins of an old mill (there r trails that go past the mill but they r growm over) and then cross a bridg. The trails proceed in either direction with lots of other trails that branch off of them.
http://www.tripleblaze.com/trail.php?c=3&i=371