This follows bits of the Red Trail
and all of the Blue Trail
at Mercer County Park. There are also 7 miles of other trails (all well maintained by the local order of JORBA) and a few miles of paved pathway. You may come across a few hikers or joggers along these trails.
Follow the lake east and you'll end up on a trail, the steepest, rooty, climb lies ahead, but its nothing crazy. There are quite a few side trails here also. If you follow the trail north and around you'll end up in a home development, swing right eventually and you'll be back at the beginning.