I know you say you are booking with
DCL, but on St. Maarten you might want to look into
www.norushtours.com They provide you with a car, driver, and cold drinks (beer, soda & water) for the day. They will take you wherever you want to go or you can leave it up to them. The prices are VERY reasonable and they have gotten good reviews on this board and others. They will meet you at the dock and return you there after your tour.
We have signed up for this tour on our upcoming December cruise. We've never been to St. Maarten before and thought this would be a great way to see the island. It is $40 for each of us, so $160 for the four of us for the day. They will pick us up at 9:00 and have us back to the ship at 5:00. Beau (the owner) was very, very easy to work with and responded to my emails very quickly.