Find out about some of New York City's best free activities. This article highlights a free boat ride in the harbor and free museums in New York. A NYC Boat tours and Hop-On, Hop-Off Sightseeing Cruise lets you see New York's most popular attractions from the water. Book your tour on a NYC. It's one of the few times you can go on a New York Harbor boat tour for FREE. This day-long celebration of our waterfront lands on Saturday.