Here is another sorta hidden place in SC that is absolutely gorgeous, Hunting Island State Park, and yes, it's an Island on the Atlantic ocean right outside of Beaufort, SC.

This was our site, and as you can see, it is right on the ocean with the morning tide coming right up to the site...the Ranger was advising us that the ocean sometimes overflows sites, which it did the morning after we left...
Here is a shot of the beach, looking down towards the lighthouse (which you can go up in)...

And if you are interested in seeing some of the sites, I have 74 pictures here:
https://picasaweb.google.com/109751677697507255922/HuntingIslandNov2013?authuser=0&feat=directlinkAnd just like the MB Map, I have a map of all the sites at Hunting Island, which we personally looked at (every one!) and circled the "best" ones, again for privacy, location and general niceness...Note that Hunting Island has no full hookups, but almost all sites have electric and water...
https://drive.google.com/file/d/0B-YeEgq5sO7NUnMwR3k0SnMzeTg/edit?usp=sharing