Abstract: The cabin of a boat is enclosed or covered by an upper sun deck having a relatively flat surface with two elongate recesses of a depth approximately equal to the height of a chair seat. One recess forms a walkway extending substantially the length of the flat surface along one side thereof, terminating at the stern end in an access opening and at the bow end in a transversely wider cockpit section. The other recess extends less than the length of the flat surface. The flat surface and recesses combine to provide a "table" area and comfortable seating for a plurality of passengers.