SeaHill Spa is the spa of The Historic Cavalier Hotel, the 1927 landmark on Atlantic Avenue. It offers massage, facials, a thermal therapy experience, hydrotherapy and nail and hair services, and the resort pictures a sauna in its spa. Advance booking is recommended; the spa is open daily from 10:00 AM to 6:00 PM. The resort does not say whether the sauna can be used without booking a treatment.