Brewster Flats
The Brewster Flats are tidal flats on Cape Cod Bay in Massachusetts, particularly near the town of Brewster, and are a unique environment. They are the widest expanse of tidal flats in North America, rivaled in the western hemisphere only by a similar expanse in Brazil.
The flats extend all the way to North Eastham.
You can see oyster farming at Skaket Beach in Orleans.