Thalasso Concarneau Spa Marin Resort

Seawater is the point here: the thalassotherapy center runs two heated seawater pools and a panoramic sauna overlooking the bay, with a long menu of treatments built around the stuff. It's a seaside spa resort just outside Concarneau, a minute from the beach, and the rooms lean into it too, done in sand and blue with balconies and mostly sea views. The restaurant keeps things light and local, very Breton. The Michelin Guide has it among its selected hotels.