http://www.hamburg.de (The page of the city of Hamburg where you can find out interesting tips and see directly if there are also nice events to be held during your travel appointment)
In Hamburg you can also use the harbour ferries on lines 72, 73 and 62 with the valid bus and train tickets of the HVV, the route with the line 62 is particularly beautiful, this also stops in Neumühlen/Övelgönne and in Finkenwerder.
http://www.dialog-in-hamburg.de (You've always wanted to know what it's like to be blind or deaf? Then go to the dialogue house and discover the world with other senses!)