I'll be renting a car in Munich in the morning on May 22 and staying in Kempten that night. I plan on seeing the exteriors (no tours) of Linderhof, Neuschwanstein, and Hohenschwangau Castles on the way. Would I also have time for a short visit to either Garmisch-Partenkirchen or Oberstdorf to get a view of the Alps? It sounds like going to Zugspitze takes some time, so that might be pushing it. How can I make the best use of the day? Thanks.