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Schwanenwerder looks like a good call
Looking in to Haus am Waldsee and Brücke MuseumGood calls!
It's on the way to Potsdam which is about 35km one way.
But you could do that, then turn right after the bridge to Potsdam at Wannsee and follow the water on the Brandenburg side ending up in Spandau. Then from there then U7 if you're so inclined which takes you back to Hmannplatz/Rathaus Neukölln/Karl Marx Straße Neukölln way. A bike ticket costs 2,50 or thereabouts. Saves you the slog and 30ish km back to NK. -
I'd recommend Liepnitzsee, it's 30km, but you could get the train from Bernau on the way back. I think you can use bike lanes most of the way. It's a beautiful lake.
This route taking in Müggelsee also looks good.
Thanks for suggestions @c.h.e.
We're staying in Neukoln although bike pick up / drop off from Kreuzberg
Figure under 50kms is about right (it's definitely going to be party pace)
I might give Teufelsberg a miss as I made it last time i visited (although i did enjoy jumping over the fence) but Teufelssee sounds like a blast
Havelberg likely to be too far for the pair of us without train use
Schwanenwerder looks like a good call
Looking in to Haus am Waldsee and Brücke Museum