One party at a time, Atlantis Banquets and Events. An extremely diverse on premise caterer, you'll find a variety of both waterfront and in-venue sites to accommodate all type of events. You'll choose from our elegant Sea Star Ballroom, the newest ballroom on Long Island, 3 stories high overlooking Treasure Cove Marina and the most picturesque Peconic River. Imported European Marble and Chihuly Chandelier greet your guests upon entrance. The Atlantis Aquarium Coliseum Room, showcase's our most captivating aquatic displays, including a 120,000 gallon Sand Tiger Shark Tank, and 20,000 gal. Coral Reef Tank-4th largest in the world. The walls are alive in this entertainment venue. Next door, The Hyatt Place East End Hotel, beautiful waterfront accommodations,buffet breakfast and much more!