Seaside Grill

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Seaside Grill Waterfront marina bar and restaurant located on the beautiful Peconic River, right behind the Hyatt East End Live music is available on weekends.
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The main waterfront restaurant & boat bar are closed for the 2024 season! Sipping margaritas by a on a sunny day right on the water…what could be better during the summer on Long Island? The Seaside Grill, located adjacent to the Hyatt Place East End & Resort Marina, 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 brunch, lunch & dinner while sipping a cool drink either poolside or at our waterfront dining area. Choose from an assortment of specialty cocktails, including rum runners, daiquiris, or our signature Seaside Sangria, or enjoy something from the kitchen, including calamari, local oysters, shrimp tacos, and more! Pool access is restricted to hotel and overnight marina guests. Pool hours vary according to season. Location: Behind the Hyatt Place East End inside of Treasure Cove Resort Marina. Attire: Casual

The hotel, located at 451 East Main Street in Riverhead, NY, consists of 100 rooms and suites and is adjacent to Long Island Aquarium & Exhibition Center and Atlantis Banquets & Events, home of the brand-new Sea Star Ballroom. The property boasts 11 meeting spaces, with 17,000 square feet of indoor and outdoor meeting, conference, banquet, and event spaces.

Cheers to another amazing season at Seaside Grill . 🍻 A big thank you to all of our guests, musicians and both our amazi...
10/18/2026

Cheers to another amazing season at Seaside Grill . 🍻
A big thank you to all of our guests, musicians and both our amazing service & culinary teams!
See you all in May for the start of the 2027 season!

We’re heading into the second-to-last weekend of the Seaside Grill season! 🌅🎶🍹After a long season of great food, cold dr...
10/08/2026

We’re heading into the second-to-last weekend of the Seaside Grill season! 🌅🎶🍹
After a long season of great food, cold drinks, waterfront sunsets and plenty of live music, we’re down to just two weekends left — so come enjoy them with us!
🎤 Friday, October 9 | 6–9 PM
Bingo Bango
🎸 Saturday, October 10 | 6–9 PM
The North Fork Dirt Band
We’re keeping an eye on the weather for Sunday and Monday, but for now, we’re looking forward to seeing you Friday and Saturday by the water! 🌊
Don’t wait until the last weekend to make one more visit. Come grab a drink, enjoy some great food, listen to some live music and soak up a few more Seaside Grill sunsets before we close for the season. ❤️
📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place

We missed you last weekend! We survived the Nor’Easter! We’re excited to be back and ready for another full weekend of ...
10/01/2026

We missed you last weekend! We survived the Nor’Easter! We’re excited to be back and ready for another full weekend of Live Music on the Waterfront at Seaside Grill. 🌅🎶🍹

It’s hard to believe, but this is already the 3rd to last weekend of our Seaside Grill season, so there aren’t many chances left to enjoy great food, cold drinks, waterfront sunsets and live music by the Peconic River.

🎸 Friday, October 2 | 6PM–9PM
The Jam Club

🎶 Saturday, October 3 | 6PM–9PM
Rubber Soul

🎤 Sunday, October 4 | 4PM–7PM
The Libations

Come spend the weekend with us—we missed seeing everyone, and we’re looking forward to making the most of these final few weekends of the season!

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

🌅 Summer may be winding down, but there’s still time to enjoy Seaside Grill! 🌊🍹Our Post Labor Day Hours are now in effec...
09/17/2026

🌅 Summer may be winding down, but there’s still time to enjoy Seaside Grill! 🌊🍹

Our Post Labor Day Hours are now in effect:

Friday: 3PM–9PM
Saturday: 12PM–9PM
Sunday: 12PM–8PM

Join us on the waterfront for great food, cold drinks, beautiful sunsets and those last few weeks of Seaside season. ☀️🍔🍹

⚓ Seaside Grill will close for the season after October 17th, so come enjoy the waterfront while you still can!

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

🎶 Live Music on the Waterfront all weekend long at Seaside Grill! 🌅🍹September weekends are better by the water, and we’v...
09/17/2026

🎶 Live Music on the Waterfront all weekend long at Seaside Grill! 🌅🍹

September weekends are better by the water, and we’ve got three great performances lined up!

🎤 Friday, September 18 | 6–9PM
Lindsay Reeve Band

🎸 Saturday, September 19 | 6–9PM
North Fork Dirt Band

🎶 Sunday, September 20 | 4–7PM
Michael Friedell

Come for the food, stay for the music, and enjoy a beautiful September weekend overlooking the Peconic River. Great food, cold drinks, waterfront sunsets and live music all weekend long! 🌊🍹🎵

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

🎶 Another full weekend of Live Music on the Waterfront at Seaside Grill! 🌅🍹We’ve got three nights of music lined up, so ...
09/10/2026

🎶 Another full weekend of Live Music on the Waterfront at Seaside Grill! 🌅🍹

We’ve got three nights of music lined up, so grab some friends, come hungry, order a cold drink and enjoy the last weekends of summer by the water!

🎸 Friday, September 11 | 6–9PM
White Room

🎤 Saturday, September 12 | 6–9PM
NoFo Band

Great food. Cold drinks. Live music. Waterfront sunsets. What better way to spend the weekend? 🌊☀️🍹

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

🇺🇸 We’re keeping the music going this Labor Day! 🎶🌊Join us at Seaside Grill as Ralph Telleli performs live by the water ...
09/03/2026

🇺🇸 We’re keeping the music going this Labor Day! 🎶🌊

Join us at Seaside Grill as Ralph Telleli performs live by the water for a special Labor Day afternoon.

🎸 Ralph Tilleli Music
📅 Labor Day — Monday, September 7
⏰ 4PM–7PM

One more reason to stretch the holiday weekend a little longer! Come enjoy great food, cold drinks, live music and a late-summer sunset overlooking the Peconic River. 🌅🍹

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

Keep the Labor Day Weekend going with The Libations at Seaside Grill! 🎶🍷🌊Spend your Sunday afternoon by the water enjoyi...
09/03/2026

Keep the Labor Day Weekend going with The Libations at Seaside Grill! 🎶🍷🌊

Spend your Sunday afternoon by the water enjoying acoustic covers, good vibes, great food and your favorite drinks.

🎵 The Libations
📅 Sunday, September 6
⏰ 4PM–7PM

There aren’t many summer Sundays left — make this one count! ☀️🍹

📍 451 East Main Street, Riverhead
🌊 Behind the Hyatt Place
📞 631-574-0127

Address

451 East Main Street (Behind Hyatt Place East End & Resort Marina)
Riverhead, NY
11901

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