We were travelling towards Karlovy Vary, when we found this castle pop up on our Google Maps, so we took a detour and did not get disappointed. Certainly a tourist attraction as the restaurants around Loket are a lot more expensive than elsewhere, BUT the castle is pretty darn cool! You get to see all the pomp and fancy stuff, but also the really nasty torture rooms. It is quite a sight to see.
If you have time for a walk, make your way around the castle by walking along the river. There are a few nice walks up into the forest as well. Serves as really nice photo spots.