Visit Karpatka II, one of the region's landmark hotels. Stay a night or two or simply take a look around.
You'll have sightseeing choices galore in Karpacz. Karpatka II is a great place to start here, but there are plenty of other fine sights to experience. Wang Church, Śnieżka, and Karkonosze National Park are near the mountainside transportation system and will fill in your day nicely.