There are about half a dozen moorings, all the same type/color (white & blue?), managed by a guy in Esperanza. I want to say the cost was $25/night.

Captain Jay @ CYOA gave me his contact info.

Glenn Kranig - 340-227-4288

Glenn is a really nice guy and had some great suggestions / local-knowledge. He pointed us towards a wonderful little anchorage on the south coast, Bahia del la Chiva. It had zero light pollution and the stars were fantastic. There was even bio-luminescence below our boat. Anchor 10-15 feet of water in the middle of the western part of the bay about even with the north tip of the little Cay. Don't go on the Cay - explosives! It's well marked.