Sit on the deck. or on the couch in the living room, or on the bed in the second floor bedroom, and watch the boats go through the cut between the beach and the outer barrier sandbar. A quick walk down the path to the beach, and choose between Lighthouse beach on the left or right towards Monomoy (shells always, see seals swimming often).
The house has 3 floors, cable (2 TVs, wifi), great AC, large kitchen, a gas grill on the deck. It sleeps 10 - with 4 kids in 2 bunkbeds in one large kid-friendly room, 6 adults in queen beds in 3 comfortable rooms, BR on each floor). A pleasant walk up to Chatham light or on to the town center.