Thursday, June 20: Thu, Jun 20: 10:00 AM- 4:00 PM
Ahot of the interior of the Aquarium


Long Island Aquarium 

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

download a map of the facility

Hours of Operation:
Weekdays from 10am-4pm
Weekends, Holidays & School Break Weeks from 10am-5pm
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 & Bees, Shark Dive, Penguin Encounter, Pirate Snorkel and more!

Named a Top 10 Aquarium for Children by Parents Magazine, Long Island Aquarium is open daily, year-round, from 10am to 4pm on weekdays and from 10am to 5pm on weekends, holidays and during school break weeks (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 11901
Visit Website

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.

The Preston House & Hotel

428 East Main Street
Riverhead, NY 11901
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The Preston House restaurant features a fine dining, yet approachable menu while sitting amongst cutting edge and historical décor and ambiance. We are farm seasonal, ingredient-driven, and our kitchen sources flavor, balance, and history. Innovative cocktails and an adventurous wine list complete our tasty options.

The Preston Hotel, a 20 room boutique hotel located directly behind the house, features studios, one bedrooms, and suites, making it a point to provide intimate and unparalleled service to each of our guests. Our spacious guest rooms feature modern furnishings, Carrera marble bathrooms and honed, concrete floors that add a touch of industrial design. We treat you to luxury accommodations and refinement in each hotel suite uniquely crafted to ensure that your every expectation is exceeded.

Seaside Grill

451 East Main Street (Behind Hyatt Place Long Island/East End)
Riverhead, NY 11901

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 coolest seasonal hot spot on Long Island’s East End. Named the Dan’s Papers Best Waterfront Restaurant, 2022. 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 dinner or drinks right on the water.

Seaside Grill features Happy Hour Specials, Live music every weekend and Trivia/Karaoke Nights on Thursdays.

Seasonal Hours

Memorial Day through Labor Day
Thursdays: 3pm-10pm
Friday: 3pm-12am
Saturday: 12pm-12am
Sunday: 12pm-9pm

Pool Bar: Daily 12pm-7pm (June 24-September 25)

Weather permitting, closed for inclement weather.

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

631.727.8386 | Visit Website

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, Flyboard, electric tour board, electric bike, bicycle and fishing pole rentals. Seasonal guided tours are 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.

The Waterfront Suite

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
Visit Website

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

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Daily Events

4:00 pm
Sea Lion Presentation @ Sea Lion Coliseum
10:15 am
Penguin Talk & Feed Session @ Penguin Pavilion
10:30 am
Sea Lion Presentation @ Sea Lion Coliseum More
11:00 am
Seal Training & Feed Session @ Seal Habitat More
11:00 am
Stingray Feed & Lecture @ Ray Bay
11:30 am
Lagoon Lecture @ Lagoon Bridge
12:30 pm
Sea Lion Presentation @ Sea Lion Coliseum More
12:45 pm
Sea Lion Selfies More
1:00 pm
Bug Encounter @ Butterflies, Bugs & Bees Habitat More
1:00 pm
River Otter Lecture @ Otter Falls
1:15 pm
Penguin Selfies @ Penguin Pavilion More
2:00 pm
Penguin Talk & Feed Session @ Penguin Pavilion
2:00 pm
Seal Training & Feed Session @ Seal Habitat
2:30 pm
Sea Lion Presentation @ Sea Lion Coliseum More
2:45 pm
Sea Lion Selfies
3:00 pm
Shark Habitat Talk (Su, Tu, W, F) and/or Feed (M, Th, Sa) @ Shark Tunnel / Mezzanine
Saturday, Sunday, and Holidays Only
Additional fee limited availability