Near the fortified port town of Concarneau, the Les Sables Blancs presides over an unspoiled strip of sand. The hotel opened less than a year ago, and has a mod, minimalist look, with bright orange chairs on a vast lantern-lit bar terrace where guests gather at night. Most of the 20 rooms have sea views from the bed and sliding glass doors that lead to private balconies. Le Nautile, the on-site restaurant, is known for creative seafood dishes like squid sautéed with bacon and cocoa beans. On a clear day you can see Les Glénans, an uninhabited archipelago called “the Tahiti of Brittany.” The hotel arranges day trips by boat to its largest island, which has a diving school and several pristine beaches.