Facility Information

Long Island Aquarium 
431 East Main Street, Riverhead, NY 11901
p.631.208.9200, ext. 426

Hours of Operation: Sunday – Saturday from 10am-4pm
Closed Thanksgiving and Christmas Day

This FINtastic destination features one of the largest all-living coral reef displays in this hemisphere, a 120,000-gallon shark tank, year-round sea lion shows, numerous touch tanks, butterflies from all over the world, and more than 100 exhibits and interactive experiences, including Butterflies, Bugs & Birds, Shark Dive, Penguin Encounter, Pirate Snorkel, Shark Keeper, and more!

Named a Top 10 Aquarium for Children by Parents Magazine, Long Island Aquarium is open daily 10:00am to 4:00pm year-round (Closed Christmas & Thanksgiving Days).

Don’t forget you can now add to the fun with an overnight stay at the waterfront Hyatt Place Long Island/East End  located adjacent to the property. Visit their website or call 631.208.0002 for more details.

Hyatt Place Long Island/East End 
451 East Main Street, Riverhead, NY
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The waterfront Hyatt Place Long Island/East End  has 100 state-of-the-art suites that offer water views, a 24-hour fitness center, indoor and outdoor swimming pools, a new seasonal poolside bar & grill, and more, including complimentary Wi-Fi access, a coffee and wine bar serving Starbucks® specialty coffees and premium wine, beer, and spirits, along with freshly made sandwiches and salads around the clock, in addition to the complimentary breakfast served daily.

Located adjacent to Long Island Aquarium and Atlantis Banquets & Events, home of the new Sea Star Ballroom, the property offers eleven meeting spaces, with more than 17,000 square feet of indoor and outdoor meeting, conference, banquet, and event spaces.

Seaside Grill
451 East Main Street (Behind Hyatt Place Long Island/East End)
Riverhead, NY 11901
631.208.9200, ext. 133
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Sipping margaritas by a sparkling pool on a sunny day next to the water…what could be better during the summer on Long Island? The Seaside Grill, located adjacent to the Hyatt Place Long Island/East End , is the newest seasonal hot spot to hit Long Island’s East End. With views of the lush scenery of the Peconic River, along with the boats dotting the shore at Treasure Cove Resort Marina, patrons can enjoy lunch or sip a cool drink under spa blue umbrellas.

Seaside Grill features Happy Hour Specials Mondays through Fridays 4:00pm to 7:00pm (Buy One, Get One Appetizer & Drink Specials). Live music is available on weekends.

Seasonal Hours – Memorial Day through Labor Day: 11:00am to 9:00pm (Friday & Saturday to 11:00pm)
September – Weekends Only
Weather Permitting

Treasure Cove Resort Marina
469 East Main Street
Riverhead, NY 11901
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Ideally located on the picturesque, boat-filled Peconic River, and part of the Long Island Aquarium family, Treasure Cove Resort Marina is the perfect place to come play and stay.

Treasure Cove is a full-service 120-slip marina with seasonal and transient
dockage that:

  • Offers conveniences such as electrical hook ups, water, satellite television, high-speed wireless Internet, as well as indoor and outdoor pools, fitness center, arcade, ice cream shop, picnic and BBQ areas, showers and restrooms, and laundry facilities, and a seasonal poolside bar & grill
  • Features in-season canoe, kayak, stand up paddle board, bicycle rentals, tours & more
  • Steps from the heart of downtown Riverhead’s tourist attractions, restaurants, and shopping with free shuttle service!

Open year-round and managed by a team that will provide assistance and experience

Long Island Canoe Kayak Rentals
at Treasure Cove Resort Marina
469 East Main Street
Riverhead, NY 11901
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Looking for fun on the forks? Spend a few hours – or an entire day – discovering the natural beauty of Long Island’s local waterways. Ideally located on the picturesque Peconic River, Long Island Canoe Kayak Rentals, part of Treasure Cove Resort Marina, features in-season canoe, kayak, stand up paddle board, fishing pole, water bike, electric tour board, and bicycle rentals. Seasonal guided tours also offered.

Hours of Operation: 8:00am to 5:00pm (April through September and weather permitting in October).
Note: Must be 18 years of age with an adult accompanying all watercraft rentals.

469 East Main Street
Riverhead, NY 11901
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One spectacular suite by the water’s edge, specially designed to bring the natural beauty of the Peconic River into a room full of comfort and leisure. Featuring coastal designed furnishings, indulgent fabrics, and timeless colors, this second-floor suite overlooking the water has a relaxing living room, kitchen, dining area, along with a king bedroom, modern bathroom with shower, and an intimate wraparound veranda with cozy outdoor chairs to sit and enjoy the astounding panoramic views.

Balcony, River View, Kitchenette with Separate Dining Area, CAC, Ceiling Fan, Phones, Wireless Internet, 42” Flat-Panel Satellite Television, Sofa Sleeper, AM/FM Alarm Clock Radio with MP3 Connection

As a guest, your stay with us includes daily breakfast, maid service, access to 24-hour fitness center, WiFi, gated private parking adjacent to suite, and beautiful indoor and outdoor pools.

Atlantis Banquets & Events
431 East Main Street, Riverhead, NY
Email: catering@amwny.com
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Atlantis Banquets & Events creates a magical atmosphere for any social event. A once-in-a-lifetime celebration deserves a one-of-a-kind setting. From our waterfront location on the Peconic River to their spectacular aquatic displays, Atlantis Banquets & Events offers the ultimate wedding on the water.

But our distinctive atmosphere is only one of the advantages we bring to your celebration. We also offer incomparable service and exquisite cuisine, and can tailor a menu to your requirements and budget.

A unique backdrop you and your guests will remember forever—from impressive weddings, Bar/Bat Mitzvahs, proms, reunions, christenings, engagement parties, and children’s birthdays to holiday galas, corporate parties, team building events, fundraisers, and conferences.

Functions involving 20 to 650 guests, in settings as diverse as waterfront Riverside Pavilion, popular for cocktail parties, elegant Coliseum Room, perfect for formal evening receptions, breathtaking Sea Star Ballroom, our Terrace Room, perfect for bridal showers or post-nuptial brunches, and Peconic Meeting Room, conveniently located in the adjacent Hyatt Place Long Island/East End

Atlantis Banquets & Events is located within the Long Island Aquarium  and adjacent to the waterfront Hyatt Place Long Island/East End at 431 East Main, Riverhead, NY. For additional information, or to find out how to book an event, call 631.574.8008, or e-mail catering@amwny.com.

Did You Know?

In addition to the sleepover, a Sleep with the Fishes adventure that includes a 1-1/2 hour morning interactive cruise aboard the Atlantis Explorer Tour Boat is also available for an additional fee. Your cruise begins at 7:30 am. A deposit is required to secure a date, and one chaperone per 10 paid admissions ages 3 - 21 is required. Atlantis Explorer Tour Boat limited to 72 participants.

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