After a Passau-Vienna-Passau boat/bike trip at the end of September, my husband and I plan to head to Luxembourg to visit our son. We've looked at planes, trains and automobiles, and are leaning towards renting a car and making a road trip. Seems as though we can save considerable money by dropping the car off in Germany (Trier) rather than taking it into Luxembourg, or even France (our destination after Lux).... So, given that we'll have about 2.5-3 days, we'd love some suggestions for an enjoyable drive northwest from Passau to Luxembourg. Even open to a stop in Salzburg.... but we'd love to hear what some of you would suggest as highlights, lovely roads, etc. Just loose suggestions--I'm open to researching the details once I get pointed in the right direction. We are open to meander, as long as we don't get too far afield! I can also post this question on some other forums along the route, if you can suggest certain ones. Thanks so much.