Too large of an area in a short period of time. Plenty to see and do in Bavaria. Lots of possibilities in the direction of Berchtesgaden along with Salzburg and Hallstatt.
Besides the Alpenstrasse, a couple more scenic drives:
http://www.rossfeldpanoramastrasse.de/en/
https://www.grossglockner.at/gg/en/t...neroad/daytrip