What are some fun things to do in NYC for my bday?

were going to a really nice italian restaurant and then afterwards im gonna have like 600 bucks between me and my sister (were twins) and we want something really awesome to do but i dont want to spend ALL the money but were all about 16 and 17 theres gonna be like 10 people. what could we do thats reallyyyy awesome?What are some fun things to do in NYC for my bday?
go to Max Brenner. It's the best place ever! Google it and a bunch of stuff comes up. It's all chocolate...my favorite resturant. Have funnn!What are some fun things to do in NYC for my bday?
cruise in tour boat around statue of liberty or timesquare sight seeing or shopping around thereWhat are some fun things to do in NYC for my bday?
How about seeing the Empire State Building and the Niagara Falls?What are some fun things to do in NYC for my bday?
Hop on down to Little Italy for desert, Ferrara's has been around forever and has excellent Italian Pastries.http://www.ferraracafe.com/

Another option would be the Chelsea Piers. Lots of activity and stuff to do. Also many of the food network shows are taped there. http://www.chelseapiers.com/

South Street seaport can also be fun. Lots of pubs and cute stores and an occasional concert.http://www.southstreetseaport.com/

Have a wonderful time in the city.
Nothing is more fun than just walking down nyc streets at night and going into the open shops

I would recommend going to see a broadway show. Unfortunately those are pretty expensive, but you could probably get a ticket to an off-broadway show like Avenue Q. Avenue Q is a great show that you MUST see! But really it's pretty great.

The ferry and boat rides are kinda lame and not possible at night. And even during the day, the statue of liberty isn't that great.

Also it you wanna be a tourist, you could go on a bus tour of the city, there's probably a few night ones too