Elegant celeb favorite on St. Martin’s French side, with a splurge-worthy spa, butler service on the beach and a legendary wine cellar St. Martin has a distinctly Côte d’Azur feel, without all the sceniness of St. Bart’s. Ditto for Belmond La Samanna, which achieves a rare blend of elegant and low-key, fusing top-notch service with a laid-back Caribbean vibe. The two-story whitewashed resort overlooks one of the few private beaches in the Caribbean, and butler service takes care of your…