Only by bike you meet the real Berlin with the wibe so many people is praising and not just the U-bahn spots with the mandatory Starbucks, Dunkin Donuts and Häagen-Dazs.
2. Rent a flat
If you are in Berlin for a week or more, get a flat! The flats are cheap and often very charming. There are 4 cool neighbourhoods in Berlin: Friedrichshain (young), Kreuzberg (multikulti), Mitte (international) and Prenzlauer Berg (relaxed).
3. Drink orange juice
The orange juice stalls are all around town. 0,2 litre freshmade for 1 euro.
4. Play table tennis or beach volley
Every little green area in Berlin have at least one table for table tennis.
In this video I am playing with Broken Foot. He is the FUNNY one:)
And many parks are loaded with beach volley courts.
5. Go dining!
Berlin has restaurants from all over the world. Cheap and high quality. Enjoy!
For instance Hot Pot. But really, just go where your nose leads you in one of the four advisable neighbourhoods.