We recently stayed at a Georgia Power owned park at Lake Hardin near Columbus. The name is Blanton Creek Park. It is really well maintained and some of the sites are right on the water. Water and electric, but the dump station is a good hike from the camp sites. There is a rally there that you are welcome to come join us at the weekend of September 12-14. Check out this thread below:
To see who's coming, the rally calendar has it at:
I also second both Veteran's Memorial and FDR. If you are into golf, Veteran's has a great golf course.
It has been a long time since I stayed at the GA Power campground at Lake Sinclare (30 years) but it was pretty run down at the time.
And of course, welcome to the forums. It's always nice to have another "southsider" amongst us. Before long we'll have enough to have our own South of Atlanta Rally.