If it rains, I recommend you to visit Jaskinia Mamutowa (Mamutova Cave ;) ?) You'll find it in Biały Kosciół that is a village right between Cracow and Bedkowice, approx. 10 km from Cracow.
Another crag where you can climb during the rain is Sepia Baszta in dolina Kobylanska. It's easy to get there from dolina Bedkowska. You have to get to the center of Bedkowice village. You should find the bus stop and shop at the village center. Then proceed down the road to dolina Kobylanska. Sepia Baszta is approx. 1 km from the center of Bedkowice, on the right slope of the valley.