You can take a ferry ride from Wansee to Kladow for free if you have a travelcard: it’s part of Berlin’s marvellous public transport network. Kladow is itself a great place to spend a day - stroll through the village and across the line of the Berlin Wall, past crystal clear lakes with good swimming beaches, to the Heilandskirche and castle at Sakrow. From Sakrow you can get a Viking ship in summer to Potsdam.
http:www.kladow-online.de
Updates
You need a Zones "ABC" day ticket (Tageskarte) - i.e. covering Potsdam and not just Berlin - to use this. The chances are you won't have one unless you are planning to get there. Or just watch out for the "inconspicuous" ticket inspectors and jump out when they jump on!
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