My plan in general is: Paris - Bruges/Brussels - Rhineland/Bavaria.
The Paris - Bruges - Koln part seems easy enough to figure out, but it's the rest I'm still unsure about. I was thinking of getting a Rhine Pass from Koln to Mainz...Assuming this takes the whole day, any suggestions on where I should stay after the river cruise? Should I just stay in Mainz, Frankfurt, or is Rothenburg close enough? I know for sure that I want to stay in Rothenburg anyways, which is why I'm asking.
Finally, I've read that driving in Germany is quite easy but I'm having a hard time convincing my wife...is it more expensive that way? Is it stressful trying to find your way around despite having maps n such?
The other option is to maybe plan a Frankfurt-to-Munich Tour thru Viator for after the Rhine cruise...that would eliminate the need for a rental car.