I second Dominica
Give Dominica a shot. It is a gorgeous island, full of outdoor adventure. You can hike, kayak, go river tubing, repelling, paddle boarding, boating, etc. The island is very fertile and has no shortage of fresh fruits. There are all sorts of springs and thermal waters. Visiting the boiling lake is interesting, as well. One of my favorite things about the island is the lack of mosquitos. The Dominicans are the kindest people, always happy.