I saw somewhere that all the towns along the Rhine are connected by walking/hiking/biking trails. Is that so? Is there a place where I can get an idea as to the length of these trails (maps even) between towns? Are the trails well marked? Is this true on both sides of the Rhine?
There is a Rhine castle trail:
http://www.loreley-info.com/eng/rhein-rhine/walking-hiking/rhine-castle-trail.shtml
And a Rheinsteig trail on the east bank:
http://www.romantic-germany.info/Rheinsteig-Trail.4134.0.html