We had a magical time at Edisto. The Beach campground was just steps from the ocean. Opt for sites 1-12 or 50-75. Bathrooms were great. Shelling was incredible-especially if you walk towards the inlet around low tide.
Our family loved our quiet stay at Cosby. The sites were large enough with nice views. Bathrooms were clean (heads-up: no showers in the National Park). The kids loved the nature trail!