I lived in St lucia for a couple of years in my youth. Although I didnt sail around the other islands we did manage to charter out of Marigot bay on occasions for day trips, snorkeling etc. As you can imagine I was able to see all wonderous things in lovely St Lucia(no other island compares from what I've been told). Lived in Black Bay, the only black sand beach I know of in that part of the carib. Spent alot of time in Soufriere(scuba,snorkelling)with excellent food and views found at the Dasheene resturant, Rodney Bay, Castries. Hot spring sulfur baths near the volcanco is a must. The volcano itself does not offer alot to see except bubbling mud, lol. Eat at the Green Parrot in Castries if you get a chance. Spectacular view over Castries and points north. Great rain forest above Soufriere to explore(bring a local)Excellent golf near Sandels, I believe the 10th most challenging nine hole in the world. When you loose a ball here dont bother looking for it, lol. If you have time rent a jeep make the drive down toward View Fort ask the locals for directions to Honeymoon beach(windward side up from club med a couple of miles). You will be the only soul around on this vast ocean front range. The light house in Vieux fort is nice with a good view of St Vincents on a clear day. Horse back riding, topless beach, windsurfing, volleyball all found on the beach near club med.. Great dining at club med as well and they will allow you to pay for a night of fun and food if you desire.
Now do I qualify to be your tour guide? If so lets go!!!!
Have fun and fair winds
Jeff