Caribbean (yachting) Islands Advice?

You should really look into St. Vincent and the Grenadines (one thing the other answerer was right about), amazingly beautiful white sandy beaches and it's an off the beaten path kind of get away. Go to Dominica, not for the beaches but for the amazing nature of the island it's self. With the most waterfalls of any Caribbean Island, and most of the island undeveloped, you can find adventure here. For really off the beaten path you could try Saba, a small island off St. Martin. It's not known for it's beaches, it's basically just a rock with a lot of charm. Truly it's adorable, clean, friendly and has world cl diving and snorkeling. Grenada, which is really three islands is also beautiful and not a place many find themselves at. There are no casinos, no huge night life but like the other islands in the chain of the Grenadines it has top notch beaches and wonderful reefs. Other islands in this chain are Mustique (rich and famous playground and Petite St. Vincent).