When you make your reservations for Gunter Hill, be sure to choose a site in the Catoma loop. Those sites are really nice with full hookups, much better in every way than the Antioch loop and well worth the extra couple of bucks.
If you like COE parks, you may want to consider Eastbank COE near Bainbridge, GA. There's not a lot to see around there, though, so you might think about just doing one day in GA, and save your 2 day stop for the Memphis area. Tom Sawyer campground is nice, but another alternative is the Hernando Point COE just south of Memphis in Hernando, MS. The sites there are pretty wide, but not real long.
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