After a long day of sightseeing, treat yourself to a little rest and relaxation at 43 The Spa. Taking inspiration from the beauty of the sea, the 3,000-square-foot retreat sits in the highest floors of the hotel and offers everything from massages to facial treatments to manicures. For a luxurious experience, book the Sublime Diamond Journey, which uses diamond dust to exfoliate and revitalize the skin. Or soothe your skin after a day in the sun with the Citrus Body Scrub and Body Soufflé, an intense treatment that moisturizes and protects skin through the natural powers of pure vitamin C.