Located near a train station, Mystic Marriott Hotel and Spa is a great choice for a stay in Groton. You can visit the spa to indulge in deep-tissue massages, body wraps, or hydrotherapy, and American cuisine is served at Helmsman Kitchen & Bar, which is open for breakfast, lunch, and dinner. Other features of this eco-certified hotel include an indoor pool, a bar/lounge, and a fitness center. Fellow travelers say great things about the helpful staff and location.