The pool at the Grand Turk Cruise Center. https://www.visittci.com/grand-turk-cruise-center
The only cruise port in the Turks and Caicos, this large complex on Grand Turk is located directly on an excellent beach and also offers a huge pool, quite a few shops and the largest Jimmy Buffett's Margaritaville in the Caribbean.
If you're coming in on a cruise for the day, this is a great substitute for a planned excursion on Grand Turk. If you walk down the beach with Margaritaville on your right, the massage cabana is just in the 2nd section - a very short walk. Ask for LaToya.