Visitors who want to get to know Hamburg properly have got to take to the water at some point. This is why the Discovery Tour ticket includes tours of the harbour and the Alster lake as well as a standard sightseeing tour. You can combine these three tours in any way you like over a period of up to three days. A day pass for the red double-decker buses allows you to hop on and off at the 20 stops along the route of the sightseeing tour for a whole calendar day.