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 best seasonal hot spot to hit Long Island’s East End. Named Dan’s Papers Best Waterfront Restaurant in 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 a snack or meal while sipping a cool drink. Courtesy delivery to Hyatt Place and Treasure Cove Marina Guests!


Pool Bar: Closed for the season

Boat Bar and Restaurant:
Friday Evenings: 3pm-10pm
Live Music 6pm-9pm

Saturday 12pm-10pm
Live Music 6pm-9pm

Sundays 12pm-8pm
Live Music 4pm-7pm

Burn out the Bar event on Saturday, October 14th
Event starts at 12pm. Live music runs from 6pm-9:30pm

Weather Permitting
Seasonal location

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Sean Fountaine

Executive Chef


Executive Chef Sean Fountaine has been bestowing his culinary skills to our guests since the opening of Atlantis Banquets & Events in 2000. As a graduate of the renowned Johnson and Wales University, he began his career at several critically acclaimed restaurants in Nantucket, Palm Beach, New Orleans and Memphis before launching his own restaurant in Hampton Bays. In 2005 he earned the Certified Executive Chef Status from the American Culinary Federation. In addition to his work with us, he is also an adjunct professor at Suffolk County Community College in the Culinary Arts Department, specializing in food safety and international cuisine. In 2010 he participated in the EUHOFA International Congress at Johnson and Wales University. Most recently, Chef Fountaine was elected Secretary of the Eastern Long Island Chapter of the American Culinary Federation.