Poinsett State Park near Wedgefield, SC. is a bit remote, but worth the effort. This is a good base to visit Congaree National Park which is a little less than an hour away. Most of the sites are dirt but are fairly level. As others have mentioned, the state road getting back to this Park is pretty rough, but nothing that will break your rig on the way in. We stayed two nights in December and enjoyed our stay while we visited Congaree. Everything seemed to be clean and maintained. The hiking trails are very nice. The main attractions here are relaxing, camping, and hiking.
Anastasia State Park near St. Augustine Florida is a true gem. Immaculately kept, it is clean and well managed. The sites are big and spacious. Most of the ones we saw were very level and all are shaded. The amount of vegetation between many of the sites make you feel as if you are all alone in a pristine Florida maritime forest. The nature trail is very beautiful, easy to walk, and very interesting. At the beach, the boardwalk leads over the dunes to a wide, pristine, undeveloped Atlantic beach. There is a small camp store and snack bar at the end of the parking lot at the beach. You can bike to the lighthouse from the campground, and the old city of St. Augustine is a few miles away. We stayed in site 139 at the end of the Coquina loop. The pictures show three sides of the rv to give you an idea of how secluded the site felt. Wonderful place!