At the 2014 Tampa RV Show we won 2 nights free camping at Stone Mountain. First time we ever won anything from an RV Show vendor raffle. We ended up going this past January for their Snow Mountain attractions.
The campground was relatively quiet. It got below freezing both nights and being on the lake it was pretty windy (it was windy enough the first day that the cable car didn't run). We were at site 335 on Trail M. It was a great site, right across the lake from the mountain itself. It was a pretty level site, good enough that we didn't bother leveling for a 2 day trip. Since it was free, we were happy with it. I think it would have been close to $50/night with taxes, etc.
-Michael