St. Bart’s is the French West Indies isle of intime, where Parisian film stars stretch out on sugar-sand beaches in sunglasses, tanning oil, and little else. Le Sereno, a resort of 37 suites and villas on the island’s Grand Cul-de-Sac cove, is the lodging equivalent of the local dress code: just enough and no more. Ceiling fans stir the gauze bed canopies in the suites’ cool interiors, while private sundecks beckon beyond glass doors. A beach arcs across the cove, where kite surfers speed over turquoise waters. At Le Sereno’s outdoor restaurant, mesh screens block the wind as diners linger over the Friday bouillabaisse, made with fish flown in that morning. Service is continental and intuitive: Before you feel thirsty, a waiter appears with Champagne.