St. Marteen is your only chance. The boat will drop you off in Phillipsburg, there are several casinos right along the area, the newest one is called JUMP UP casino, opened a little over a year ago right at the end of the downtown strip/shopping district. The other area for casino is by the airport, about 1/2 hour cab ride, it has Dolphin Casino, a short walk from Dolphin casino, you can go to the MAHO area, and there are several other casinos.
Good luck on the trip, and enjoy ! ! ! !