Krakow

Krakow is the classic tourist destination in Poland. It is not short of daytime activities: the amazing salt mines and the Auschwitz concentration camps both make a day trip, and the old town and castle provide a couple of days of looking around. As a top tourist destination and student city, the nightlife is also not sluggish - you shouldn't find it too difficult to have a few good nights out. The accomodation is also excellent here. If you want to experience Poland and only have time to visit one place it should definately be Krakow.