My favourite place is Karpacz. There I was two times: on 6th June 2007 and 21st August 2009. It was a trip.
In Karpacz you can see the Wang Monastery, which is build in norwig style. This building is situated on the higher parts of town. Near the Wang Monastery tourists can enter the Karkonoski National Park, which contains the highest top in Sudety (Śnieżka) and lots of beautiful rare animals and flowers.
I think you should go there. So many people recommend this place.