Washington DC Sunset Dinner Cruise with Buffet. Take in the city skyline during sunset in Washington DC on an all-you-can-eat buffet cruise. Board a luxury boat for a sightseeing cruise on the Potomac River with dinner and dancing while a DJ spins your favorite tunes. Pass by illuminated landmarks such as the Washington Monument and feast on a variety of delicious dishes during the 3-hour tour. Book and Save 25%: Washington DC Sunset Dinner Cruise with Buffet.