1. Any park in NYC. Put in your hotel address and find the closest one here. A nice break for the kids to relax. And you too...
2. The Staten Island Ferry. Great views of downtown Manhattan, and the Statue of Liberty.
3. The Bronx Zoo: Free on Wednesdays.
4. Brooklyn Botanic Gardens: Free on Tuesdays.
5. Libraries. The main library in Manhattan is amazing, as is the Central branch of the Brooklyn Public Library, seen here.
7. The Brooklyn Brewery. They give free tours on the weekends.
8. African Burial Grounds. They are currently renovating, but are scheduled to be open October 4. Check back here to find out the status.
9. City Hall. Lots of history here.
10. Coney Island. The boardwalk and beach are amazing.
11. Federal Reserve Bank. Free, but you have to make reservations.
12. Forbes Collection. I went years ago, and should really go back soon...
13. Grand Central Tour with Justin Ferate. About 2 1/2 to 3 hours, and amazing.
14. Greenwood Cemetery. A nice afternoon's walk in Brooklyn. Events sometimes held here also.
15. Walking the Brooklyn Bridge. Here is a great guide with the ins and outs. I recommend walking across to Brooklyn and checking out the Brooklyn Bridge Park.
16. South Street Seaport. Yes, it's shopping and restaurants, but still just going doesn't cost.
17. High Line. Really cool elevated park that used to be railroad tracks.
18. See a baseball game... Staten Island Yankees. So close to the SI Ferry you can walk.
19. Governor's Island. Weekends all summer. Free ferry, and tons of events.
20. Winter Windows. See the display windows of Barney's, Bloomingdales, Saks Fifth Avenue, Lord and Taylor, and Macy's.
22. Flushing Meadows Corona Park in Queens. The Unisphere. Worlds Fair 1964. Big Park, surrounded by Queens Museum, Queens Zoo, NY Hall of Science.
23. MOMA. Free from 4 to 8 on Friday's.
24. American Museum of Natural History. Free for the last hour (4:45 to 5:45)
25. Brooklyn Museum. Free every first Saturday.