I'm definitely 100% in on Dominica. Not a place I'd do on my own.I think in St. Thomas we will just walk around. They have blackbeards castle there you can tour, good beach's, and the sky thing you can take. I was going to ask Larry since I know they have been there. I think a beach day there and in Barbados will be good enough. I don't want to have an "eh" beach day in St. Kitts. For St. Kitts there seems to be a lot of historical sites/etc. you can visit. Plus we can also get in some beach time in St. Martin.
St. Kitts might be a "South Friars Beach" at Shipwreck bar kind of thing.
I'm not sure about St. Thomas. I've been there several times but I don't remember it. It's probably been about 6 years I think.
I'll send the email!