High Falls State Park is located south of Atlanta, near Jackson, GA. It is only a couple of miles off I-75 for those who are headed up or down the big asphalt.
There are two campgrounds, but for many basically the option is the river campground. The lake campground sites are only 25'. The park fees run $29.00, except for a few premium pull through sites. Most have 30 amp service, but a few have 50. All other sites are back in, but the angles are good.
There is a pool onsite ($5.00) per person/day. There is also a hiking trail that runs by the falls which is fun for those who enjoy lots of steps.
Just down the road is a water park (small, compared to the mega ones in FL), that is open seasonally from 11 to 5).
We enjoy High Falls because its not a long trek from Atlanta, but far enough away.
Link:
http://gastateparks.org/HighFalls