Probably the highlight for Berliners when it comes to going hiking. Good connection there. Forest paths along the Briese. Personally, I find that many people dump their rubbish in the forest around Briesetal.
A short, easy 3.7 km walk with lots of photo opportunities along the way. Not overcrowded, like other locations might be. Easy to get to from Berlin, you can start moving straight away from the nearby car park.
The Briesetal offers a trip into a beautiful forest like from the fairy tale. The waters and birch groves are very beautiful to look at. Hiking or cycling is unreservedly recommended!