Black Rock Mountain State Park is the highest state park in GA. The moderate Tennessee Rock Trail (yellow 2.2 mile loop) and Black Rock Lake Trail (.85 mile loop) are beautiful.
5$ day pass or 50$ annual pass which covers all GA state parks
3085 Black Rock Mountain Parkway
Mountain City, GA 3056
https://gastateparks.org/BlackRockMountain
https://gastateparks.org/sites/default/files/parks/pdf/trailmaps/BlackRockMountain_TrailMap.pdf