Berlin and its region offer an enormous potential for recreational activities of almost any kind. It is a very “green” city. Over two thirds of the territory is comprised of lakes, forests and parks. Big parks, woods, and green areas in the city center and around Berlin are open to cyclists, hikers, and runners. The most famous lakes are probably Großer Wannsee and Großer Müggelsee.
On the outskirts of Berlin, Potsdam and the surrounding region of Brandenburg, with its nature reserves, water landscapes, castles, and palaces, is worth a visit. The most famous park grounds can be found in Brandenburg’s capital, Potsdam: Sanssouci Castle, a UNESCO Cultural Heritage Site.
Berlin from below (Berliner Unterwelten e.V.) offers tours of subterranean architecture exploring Berlin's political history from an unusual perspective by visiting underground bunkers and subterranean escapes.
Berlin Wall Trail "Where the Wall once was": One of the most interesting bicycle tours leads you along the former position of the Berlin Wall. Most parts of the paved patrol path still exist and are suited for cycling.
In the city center the course of the removed Wall is marked by a cobblestone line; here you can follow the former border between east and west on quiet side streets. A special map illustrates the tour for cyclists along the path of the former Berlin Wall: "Berliner Mauer-Radweg" by Michael Cramer, Esterbauer Verlag.