I'd recommend Barbados. As for which resort, that depends on your personal interests. Sam Lords Castle or The Crane (both on the south coast) are excellent resorts. The EdgeWater on the east coast is a picturesque and quiet resort. If you're in to sun and beach...then go with a resort on the west coast.
There's lots of things to see and do in Barbados, too. They've got two large cave systems (Harrison's Cave and Flower Pot Caves near Pico Teneriffe). A wildlife zoo. A few ruins to explore. Parasailing.
And if you choose Barbados...you HAVE TO spend at least a day at Bottom Bay! (the most beautiful white sand, torquoise water beach you can imagine).
My
SilentKnight