A helicopter ride over Manhattan, New York should definitely be on your bucket list. One of the coolest thing I have ever done.
Just being in a helicopter is a pretty cool feeling and seeing New York that close from the air was just great. Yes, New York is also my favorite city in the world.
It's easy to, there are several companies offering trips from lower Manhattan. We used Liberty Helicopter, it was very effective and a good experience, but I'm pretty sure the other companies are pretty much the same. The price is around USD 150 for a 15 minute tour (you don't need more).
Just make sure you take the time to look around you and not take pictures all the time:) Some pictures from when I did it.