Experience our Spa, Aquarium, Seaport, Museums & fine dining. Located in Groton, CT, the Mystic Marriott Hotel & Spa is the hub for corporate, group, conference and leisure travel in the Mystic,CT shore region. This destination is an architecturally stunning Connecticut hotel boasting 285 rooms and suites. Experience Mystic Seaport,Mystic Aquarium,golf,beaches & nearby Mohegan Sun & Foxwoods Casinos.