The Circle Line
We highly recommend taking the full three-hour circle line cruise, a narrated boat tour taking you around the entire island. This is one of those things that we can feel safe to recommend to anyone, no matter if it's your first time in New York or if you have lived here for years.

From their Website:
The Full Island Cruise - 3 hours
Enjoy a relaxed and refreshing 3-hour cruise as you discover the secrets of the city. You'll circumnavigate Manhattan Island and see it all - 3 rivers, 7 major bridges, 5 boroughs, over 25 world renowned landmarks and, of course, a magnificent close-up of the Statue of Liberty. Beverages, food and souvenirs are available on board. From Pier 83 at 42nd Street on the Hudson River.
Adults $29 | Children $16 | Senior Citizens $24