It sounds like it would be awesome anyway. If you have the chance to take three weeks, do it. You could maybe think of taking the Rhine river route into Switzerland, as it would be mostly flat and a lot of cool places along the way.
http://www.rhinecycleroute.eu/
http://www.rhinecycleroute.eu/stages
Nice route! Although I can't see how to fit the Rhine river if then I want to do the Furka..
Tips about the Blackforest? I'm looking at some saucy gravel sections, but no street view is not helping much..
@giofox started
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It sounds like it would be awesome anyway. If you have the chance to take three weeks, do it. You could maybe think of taking the Rhine river route into Switzerland, as it would be mostly flat and a lot of cool places along the way.
http://www.rhinecycleroute.eu/
http://www.rhinecycleroute.eu/stages