The largest green area in the city of Berlin is a beloved area of relaxation for both locals and tourists. One of the popular activities to do here is to hop on a ferry and get to the Lindwerder island. To get a great view of the surroundings, climb up the Karlsberg and visit Grunewaldturm.
Wikipedia https://en.wikipedia.org/wiki/Grunewald_(forest)
More information http://www.visitberlin.de/en/spot/grunewald
Address 14193 Berlin, Germany
Coordinates 52°28'23.22" N 13°15'28.839" E