I tend to think of the Caribbean as a place for sailing. Nothing else to do there unless you like to sit in a chair and order umbrella drinks like Milton Waddams. Get to Tortola, grab some snorkeling gear, lease a bareboat and island-hop around the BVI while imbibing rum is a good plan.
But Guana Island is another thing: a nature preserve, a privately-owned 800-acre island, and takes only 30 guests at a time. I'll call it Jurassic Park because they are dedicated to restoring native species. No Limbo Rock, guaranteed.
(The "Enter" button doesn't work. Stop pushing it. Use my link.)