I will begin
For sure you shlud visit St.Lucia : ) Two places I will recomend - Soufrière Town - southwest
coast of the island. It is now a small sleepy fishing port with an emerging tourism industry. It boasts several attractions including a "drive-in" volcano, the Diamond Botanical Gardens with waterfall, and historic mineral baths, plus the nearby beaches.
There is no marina but you can stay on bouys (quite cheep) . So there are also no maina facilities. But it is very "local atmosphere" with really good local
restaurants. Second place totally diffrent - Rodney bay - about 4 hours from Soufiere Town - northwest coast. Big anchorage in front of the beach and big marina ,very modern and new marina with all facilities. Of course more expensive .