As of last year there was only one cabin for rent, all the others fell victim to beach movement.
I read that it is the most visited state park in SC. While we always found it crowded, we were able to find openings for our three times camping there with only a month or two notice; however, it was always after or before the summer, school vacation time, and not during a holiday. It seems like one time we had to rent two different spots, (consecutively, not concurrently), in order to stay the entire week. The back loop has more privacy and shade and we found that it usually had more open spots, but is farther from the beach.