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Boats traveling the Thunersee leave from Interlaken West. If you go all the way to Thun, you will see many cute towns and beautiful buildings/small castles on your way (Spiez, Oberhofen). There is also a castle in Thun. Boats travelling the Brienzersee leave from Interlaken Ost. The water in the Brienzersee is a beautiful shade of turquoise. The boat is free if you have the Swiss rail pass.