First Day in Wrocław

Having waken up at 2:30, I flew to Poland which is my favourite country for some reasons. To be honest, I cannot remember well about morning especially before the arrival at Wrocław Airpot as if it were of long time ago, probably because I was über sleepy. Anyway I got to the hostel safely, though I was caught by rain as weather forecast had said "cloudy thunderstorms with rain". The rain was actually the heaviest one since I had left Japan. It's expected to be raining tomorrow, so what will I do?