Seacoast Science Center sits inside Odiorne Point State Park, which gives it a better setting than most small marine museums. Its exhibits focus on the Gulf of Maine, rocky-shore ecology, marine mammals, local fisheries, and the practical science of this short but rich New Hampshire coastline. The museum is compact, but the surrounding park makes the visit feel bigger.
It is a strong family stop and a useful bad-weather choice, especially if you also want to walk the park trails or look across the water toward the Isles of Shoals. Check hours before going, since the center and state park do not always operate on the same rhythm. For Portsmouth visitors with a car, it is one of the easiest ways to add coastal ecology to the historic-town itinerary.