Travel / Do I need to speak Polish in order to enjoy Poland as a tourist? [14]

My Polish is that good. I am in Polish class right now. I read better than I speak it. We plan to to visit in Poland in 2012. But I am worried that I will not be prepared enough for the trip.

We plan to go to Warsaw and Poznan as my family is originally from Poznan.

Any helpful hints to keep me going and not give up on my Polish?