NewYork.com offers two tickets to the American Museum of Natural History's A Night at the Museum Sleepover in New York City for $246. (Tickets are $123 each but you must buy at least two tickets.) That's $44 off what the museum charges direct. You'll need to bring your own sleeping bag and pillow, but a light evening snack is provided, and the museum’s food court will remain open until 7:30 pm. The sleepover runs from 6 pm to 9 am the next morning. It's available on select Fridays and Saturdays in May and June.