Tempelhof is a recently disused airport that has become one of the largest green spaces in Europe. Best way to enjoy it is to rent a bike and cycle down the runaway at full speed. Go on, VRROOOOOM!
Tempelhof S-Bahn (you can take your bike on the train)
Platz der Luftbrücke 5, 12101 Berlin, Germany
Google map: bit.ly/JWW8FY