Spa at La Terrasse
At La Terrasse shopping center in the midst of tacky Maho Beach (think Atlantic City before the Borgata), this spa is a cool counterpoint: The minimalist reception area leads to a tunnel, which opens onto a grottolike coed wet area. After moving among jet-massage stations in the volcanic rock pool, take a steam in the hammam, then plunge into the ice hole, and finally settle into a session in the Alpha Capsule 2010, a private sauna that helps you sweat out toxins. Sun-parched skin? Try the St. Barths Sensation ($130), a cooling body mask using plant oils and aloe vera (massages, $90$110).