You could spend several days in the Big Apple, cause many of interesting things are worth to be explored in there. Normal walk among those large skyscrapers will be amazing, especially if you have never been in different city like that. But if you better like regular jungle then city one, you should visit zoologist garden, one of the biggest places like that in whole world. Also, if you are an admirer of a nature, you must to spend couple hours in the Central Park. It is situated in the middle of Manhattan island, the most famous area of NYC. You could ride a bike there, go for a jogging, or only have regular lunch on a grass. But beware, during the night some parts of it are not save, so you better not go there after dark, cause you could get robbed or worst. If you like to have some cultural experience, you may go to the Broad way to visit some nice play in the theater. This street was the most important place for actors, but even though those days are over, plenty of nice shows are playing there. When you will be arranging flights from New York to Warsaw, remember about EU food policy – you cannot have anything from animals origin.