Enjoy a full day nearby Salzburg and see the bavarian mountains.
The drive will take you from Salzburg to Hallein and Bad Dürnberg (possibility to see the salt-mines).
then over the border to the Obersalzberg (between May and November you have the possibility to see Hitler's eagle's nest, otherwise the documentation center) where Hitler used to have his summer residence.
Enjoy the mountain views and see the village of Berchtesgaden, a very nice mountain village with lots of history from King Ludwig, to churches until nowadays.
See the village of Ramsau and the Hintersee, one of the purest and most beautiful mountain lakes in the area, or see the Königssee, the deepest lake in the area, crystal clear and just stunning.