Closed campgrounds

Stone Mountain GA campground is open. The attractions are closed but that's OK. There's really no reason to close any campground as it's likely some of the best social separation available. Open air and long distances are exactly what stops this virus! Book it online, wave HI as you go by, pull into your site and light a campfire. Just doesn't get any better than that.
As a side note, I mention Stone Mountain as I "had" reservations there arriving next Monday. Things at work went completely sideways with this disaster and I could not leave work. Stone Mountain refunded my reservation fee without hesitation and we hope to visit again as soon as things stabilize in the next couple of weeks.