Cycling 4:10:00 [1] 77.0 km (18.5 kph)
The goal was Zirkelstein, but I hadn't checked the route were accurately and quite soon after Königstein noticed that the road wasn't ridedable without a mountain bike. Then decided to try the Bundesstraße, but as I reached the street, I decided that with a child better not. We enjoyed our lunch in Königstein and drove back.
Now I know that one should use a ferry in Königstein to get to the otherside.