\|There are tons of things you can do in NY. But taking the ferry to Ellis Island is definitely something I would recommend. The views on the skyline of Manhattan are great and the visit to Ellis Island is incredibly interesting. The tratment of the immigrants, what they had to go through, there things and voices. The museum enables you to put yourself in their footsteps. Great introduction to american history.
The visit to the statue of liberty did not impress me that much (but that's simply because we have seen it so often and we've all heard so many things about it.
Take your time in Ellis Island and take the audio guide. It's definitely worth it.