I love Berlin and of course I want to go while my stay here. Train is very expensive so I found a bus company called Flixbus that have very cheap prices to travel all around Germany and some Europe destinations too.
One of the highlights here in Hamburg is the Harbour. There are many touristic companies the offer boat trips, but with your student card of HAW you have all the public transport for free, and yes there is a boat to that you can take completely for free too. Worth to visit are the Philharmonic building, free payment visit and Rathaus.
On sunny days it is nice to have a walk on the city beach, reachable by bus. The place is called Strand Övelgönne.
Feeling hungry? Best Pizza in town in “Pizza Bande” also Vegan pizzas!
If you feel like party then Reeperband and st. Pauli are your neighbours.