One of our favorite seafood shacks is Al’s Seafood in North Hampton, New Hampshire. There is also a fish market on site and you enter through the fish market doors.
There is a walk up order counter with the menu on boards surrounding the counter. Choose your entrees and receive a number. The dining area is adjacent to the order counter. You seat yourself, get your drinks from the various dispensers and when you food is ready it will be brought tom your table.
This is certainly a no frills restaurant but the quality of the seafood makes up for the lack of ambiance. You cannot go wrong with any of the fried seafood options.
They also have decent burgers.