My family will be traveling this route in September, flying into Munich from PDX. We are renting a car for the 2 weeks we are there and staying 2 nights Salzburg, Venice & Rimini. Then one night in Milan, then back up to Garmisch-Partenkirken, then to Munich for a week for Oktoberfest. I would appreciate any driving advice. I am a little worried about parking the car for 2 days when going to Venice, and should I be concerned with any of the roads on the overall route?