This is a great day trip when you're tired of Berlin's eternal hipness and just want to go look at some red squirrels in the woods and take a swim in a lake. It's also dirt cheap if you get the timing right.
You get the S-Bahn to Wannsee - it's a suburb in the south-west of the city. Come out of Wannsee station and cross over to the ferry port. Here you'll see a load of tourist boats, but also the 'BVG-fähre' boat to Kladow, a workaday ferry which leaves on the hour. So if you're lucky your S-Bahn ticket will still be valid and you can just hop on.
The ferry journey lasts about 20mins and takes you past an intriguing resort called Strandbad Wannsee - all 1920s architecture and neat rows of sunshades. You can imagine the flappers of the Weimar era frolicking there in their droves.
On arriving at Kladow you could take a right and follow the path into the woods - we did, and spotted a vivid red squirrel within minutes, which put us nicely in the zone for the rest of the day.
Once you're in the woods, and the parks and lakes beyond, you can just idle about the place and you are bound to find something to capture your imagination - for us it was a quick swim in the lake (there are a few sandy shores here and there), coming across an old orchard of gnarly apples and finding a dilapidated house that was once home to the Mendelssohn family.
Back at the bar on the shore by the ferry you can order some potato soup, wash it down with some Weisse beer and let the ubiquitous sparrow population entertain you. Then you can wind you way back to the hipster capital of the world a little less world weary.
The travel for the whole day cost us less than €5 as I recall, which made the wanderings even more carefree.
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