At 3,000 acres, Grunewald Forest is the largest park in Berlin. There are 150 km+ of roads and trails. There’s a mix: some wider roads and allées, and some narrower, more rugged trails. Most of the terrain is wooded. Since there are so many options, we don’t proscribe particular routes. Here are some running highlights:
 
Some lakeside path perimeters include 2.5k around Grunewaldsee, 4k around Krumme Lake, and 8k around the Schlachtensee. One option is to do a long run, such as to the south end of Lake Schlachtensee, and then the S-Bahn Nikolassee station. A good hill option is to follow the trail called Teufelsberg, which is a 115m high mountain made out of rubble from WW2. Now that’s a one-of-a-kind ‘er.!