Cycle from prague to karlstejn castle on a guided bike tour with your local guide youll enjoy a leisurely cycle along the banks of the river vlatva passing through beautiful czech countryside on the 18 mile 30 km ride have lunch in the village of karlstejn own expense and then enjoy a guided tour of karlstejn castle one of the most famous castles in the czech republic return to prague by train giving you a chance to rest your legs