While this museum may be small in size, its big in heart. Thanks entirely to Paul B. DeOrsay, the museum's director, greeter, and all around nice old man. When he recommends you watch the twenty video courtesy of Mystic Seaport (CT's larger whaling museum) to get a better understanding of the toil and difficulty of whaling through actual film taken on an actual whaling ship, take him up on his offer, it will color your whole experience.
The museum, which consists of about three rooms, is full of fun stuff, including a real whale boat (the smaller ships on the side of the main boat used to chase and harpoon the whales), some lovely intricate scrimshaw work, and a few of my favorite things of all time: dioramas and animatronics. Worth a stop in if you are taking a leisurely day trip in Northern Long Island.