N 40° 55' 3.84'', W -72° 39' 15.42'' booked.net TIDES >
Hyatt PoolSeaside Grill


All Treasure Cove Resort Marina seasonal dockage customers receive a complimentary annual membership to Long Island Aquarium, along with a 50% discount on all children’s camp programs. 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 & bugs from all over the world, and more than 100 exhibits and interactive experiences. The Long Island Aquarium is open daily from 10am to 5pm year-round (Closed Christmas Day & Thanksgiving Day). 631.208.9200, ext. 426 / www.LongIslandAquarium.com

Just steps from Treasure Cove Resort Marina beckons the Hyatt Place Long Island / East End with 100 state-of-the-art suites. Hyatt Place brings the authentic hospitality for which Hyatt is known to the upscale select-service category of hotels. Marina members have the use of the Hyatt Place fitness center and indoor and outdoor swimming pools.

Next a break from the boat? Spend the night in the recently renovated Hyatt Place, with suites overlooking the marina.  You can also book the Waterfront Suite, which has a large king-sized bedroom, kitchenette, full bathroom and outdoor veranda with seating. For the ultimate luxury stay, reserve a suite at The Preston House & Hotel, directly across the street and featuring modern furnishings and lavish amenities.


The indoor pool is available year-round from 6:00am to 10:00pm; the outdoor pool is open from 10:00am to 8:00pm (Outdoor Pool Hours are Seasonal – Memorial Day through Labor Day).

Complimentary canoes, kayaks, and bicycle rentals are available at Long Island Canoe Kayak Rentals for seasonal Marina members from 8:00am to 4:00pm daily. Visit the Marina office to reserve.


Pumps are open daily from 8am-4pm. Please visit Marina office for service, or call us on VHF Channel 11


There are charcoal grills located at the top of each dock, with a picnic area located along the Peconic River. (Charcoal and lighter fluid is available for purchase in office).


Both shower and restroom facilities are located near Dock D.


Available year-round for $2/wash & $2/dry. Detergent & Dryer Sheets cost $1.00 each.


Located just outside the Marina office, available 24-hours/day for $2.50 for a 5lb bag, $6 for a 16lb bag, and $15 for a sleeve.


Pets are always welcome, but please be considerate and keep them leashed at all times and pick up after them.


Our Shuttle makes a loop at all the popular, local hotspots. Meets at the Hyatt Place daily in July & August.

Riverhead Taxi – 631.727.0707
Enterprise Rent-A-Car – 631.369.3600
Elegant Limousine – 631.345.5541


The Seaside Grill is located on the banks of the Peconic River and steps from the Treasure Cove Resort Marina. Guests will enjoy the tranquil view along with delicious cocktails and traditional favorite fares. The lounge style seating provides pristine views with luxurious comfort, while the floating dock dining room offers a more traditional, yet modern seating option.

Seasonal location

Click HERE for the Seaside Grill website


Located at the Aquarium, with Walk Up Window facing the docks.
Open daily in July & August from 10am to 5pm
Weekends & Holidays in April–June and September-October from 10am to 5pm.


The Preston House & Hotel features a new American restaurant featuring an upscale, yet approachable, dining and drink menu in an ambiance that’s at once cutting edge and historical. The 20-room boutique hotel located directly behind the restaurant, features studios and suites, with modern furnishings, Carrera marble bathrooms, and honed, concrete floors that add a touch of industrial chic.