The bicycle tour we took while in Germany was a day trip to the City of Potsdam. We started on the northern edge of Grunewald, a forest on the western edge of Berlin, and biked through the fall colors along Lake Wannsee about 12 miles to the City of Potsdam. The terrain was a bit hilly, which was a change from the completely flat topography in Berlin. As many people on road and touring bikes powered up the hills pass us, we had a tinge of homesickness for our touring bikes.
We had a bite to eat and walked around Sanssouci Park, the site of summer palaces that once belonged to Prussian royalty, before we took our bikes on the train back to Berlin.