My wife & I are planning a trip in which we fly in & out of Amsterdam, and then do a driving loop consisting of Normandy, Alsace-Lorraine, and, Cologne, before returning to Amsterdam to fly home to the U.S. My question is, besides the aforementioned locales, is there anything noteworthy to visit that isn't far from this "loop", whether in eastern France, western Germany, and even Luxembourg & Belgium? We're not that much into museums - more into walking through charming towns with narrow streets, shops, restaurants, and such, and interesting natural sights.
Thank you.