Have a great trip, Whirly. Salzburg is a great place to land. The airport is really very close to the town, you can stand on the castle ramparts and watch the planes taking off. If you find an excuse to file out to the east, you can fly pretty much right over the town. Nice GA facility too with AIS and Met on site.
Can recommend only one town down that way, which is Konstanz. Its a little off your route but its a nice grass strip with English speaking and friendly staff, though if you're down that way Freidrichshafen might be better if its just a fuel stop as its cash only at Konstanz. From there to Salzburg you fly along Lake Constance over Overammergau (sp?), Neuchwanstein castle etc with the Alps on your wingtip but plenty of flat land if the worst happens. Very pretty.
Don't forget to tick the box on the FPL that says you've got an ELT.