There is the Cousteau marine park pn Guadalupe worth a stop. The Saintes are beautiful, you could spend 2 days there just enjoying the culture, food and beautiful beaches. My European friends say it's closer to a small French village than a Caribbean island. We usually spend 3 days on Dominica, but I haven't been there post hurricane. The river tour near Portsmith is fun. Trafalgar Falls is doable by bus from Roseau. We use Sea Cat for moorings and tours in the Roseau area. Victoria Falls is a nice hike as is boiling lake if you're in shape for the arduous hime.