In Summer (late Spring too) you can take one of these ships and visit the Old Prague. There are also organized tours to the Slapy Dam (a 4 hours tour) and downstream tours to the Zoo and Roztoky. To take a river tour you have to head to the pier next to Palacky bridge (Karlovo namesti underground station). No, we wont take one of these boats, sorry. We will take a look at the Prague Castle, from the other side of the bridge ...