Berlin Charlottenburg Park
Schosspark Charlottenburg situated inside the area of the Castle of Charlottenburg is one of the favorable places of Berliners and those who travel around Germany or simply have a trip to Berlin. The green area of the park is free, so you can go there to have a walk even if you are not interested in the Castle.
It covers a really large area and you can get in from the entrace just near the "New Pavillon" (Neuer Pavillon a.k.a. Schinkelpavillon) placed on the right of Luisenplatz.
The nearest station is Sophie-Charlotte Platz on the U2.