Another vote for High Falls State Park. Its a wonderful park.
There's a restaurant right next door to it, but otherwise you might find yourself driving a little ways to find food. The park is right off the interstate.
I don't know why people always talk about driving through Atlanta like its some kind of warzone. I've driven through it a great number of times, including with camper in tow. Avoid the morning and evening rush hours, hunker down in one of the middle lanes and roll on. Sure, you might encounter an accident or some other issue, but its no different than what you might find on other roads.
To put it more bluntly, if you fear towing your camper on the interstate through Atlanta, then perhaps you should be reconsidering whether or not you should be towing in the first place.
