A Pretty City
A lot of people don't think there is much to Poland, besides Krakow in the south. But Warszawa has quite a few things to do! There is the Old Town which is beautiful and a nice place to get food, you also have the Warszawa Uprising Museum which is totally awesome and a must see. I would also suggest going to the top of the Soviet built Palace of Sciences and Culture (or something along those lines) and paying to go to the top, from the top of this building you can see a beautiful view.
Insider Tip:Bring some warm weather clothes, I went in late May and was cold with a jumper and a Northface.