Time Out says
Live music, booze, food, fireworks and a beach view—you can’t ask for much more than that on Independence Day. Last year's party began at 9am and went until midnight, so assume you're in for a full day of partying, unless you need to leave for a quick drunken ride on the Cyclone (you will definitely be tempted). The blowout ends with an incredible firework display at 9:30pm. Best viewing location: The Steeplechase Plaza and the Coney Island Boardwalk.