Hello, I recommend Guadeloupe, especially in the Jacques Cousteau marine reserve, there are many dive centers at Malendure and also a nice smaller family one Anse Caraibe Plongée which is really nice. They also rent out bungalows or recommend some close by. They dive in the Jacque Cousteau reserve, but also do day trips to the Saintes (le Sec Patée dive is very beautiful and a must do) as well as on the other side of the island, and have some nice wrecks as well.
While local people speak Creole with each other, they also speak standard French, especially with tourist that are not native French speakers.
Plus the food is absolutely delicious.
Next best would be Martinique, and the others far behind only,