Dewees Island is Charleston's premiere natural island community with a beach. It's the 3rd island north of Charleston Harbor. It's private. You have to be invited to come above the high tide line. Renting one of the Huyler House Suites is a great way to be invited.
You get to Dewees by private ferry. The ride is very relaxing. You might see dolphins, osprey, eagles and even deer along the way.
On the island the beach is wide open, with very few other people around. There's great fishing, kayaking, tennis, bird watching, swimming in the pool or ocean and many more activities.