In 1993, the Great Bay Discovery Center (formerly known as Sandy Point) was constructed on the shores of Great Bay. Located in Greenland, NH, it serves as the conservation-education headquarters for the Great Bay National Estuarine Research Reserve. A universally accessible trail and boardwalk allow visitors to explore a variety of habitats including upland hardwood forests, freshwater wetlands, salt marsh and mudflats. Visitors can stand on the deck of a 19th century gundalow replica or wander through the native gardens surrounding the center. Birders find the Discovery Center an excellent location to watch for Great Bay's wintering eagle population, migratory warblers, waterfowl, and locally nesting pairs of osprey.

Inside the Discovery Center, visitors are treated to interpretive exhibits about the Great Bay Estuary and the amazing creatures that call it home. Children can get their hands wet in an estuarine touch tank as they learn about lobsters, horseshoe crabs, mud snails and more! Interactive displays about salt marsh farming, salmon migration, plankton, tides and research on the Bay, allow children and adults alike to learn about the Estuary.