Our last day in Germany we would like to drive from the Freiburg region to Frankfurt. We would like to do this along the Rhine River but have noted that there are few roads that follow it along the Germany side. There is a long stretch of road on the France side but "Street View" shows that a lot of it is some distance from the river or well treed on both sides.
Would appreciate any recommendations for maximizing our views as we head north (Germany or France sides) even if it means small side trips to get to the good views. Castle recommendations along the way also appreciated though we will only have one day to complete this route.