Fondest memory: Koblenz is located in Germany's winegrowing region. South of Koblenz is the so-called Rheingau region. The drive thorugh the vineyard is a great experience. In this hilly region almost all hills is covered with vines. Every now and then you can stop in a village and have a glass of local wine in a tavern. Better to travel by bike because you shouldn't drink and drive a car.
Favorite thing: Koblenz is located in one of Germany's most popular vine growing regions and it is a must to drink a local wine here. I enjoyed one glass of red wine while cruising the Rhine river!