We traveled to the cape last year and went to Seafood Sams for dinner. You have to order up front and pick up your order when ready, but there are plenty of places to sit and the food is excellent.
Seafood Sams is a great place to get seafood on the Cape. You order your food at the counter and they call your # when your food is ready. The food is always fresh and tasty. It is closed during the winter months.