If you love mountains or/and nature, this area should be on your "a must see" list. I haven't seen before so many nature wonders concentrated so close to each other. There are many wonderful mountains to climb or hike (Watzmann, Hochkalter, Schärtenspitze...),rocky ravines (Wimbachklamm, Almbachklamm),waterfalls (like the highest one in Germany - Röthbachfall),post-glacial lakes (like Obersee or famous Königssee),some ice caves...
Furthermore, your every trip is watched by ubiquitous cows and you can hear endless ringing of cow-bells :) It seems to be some kind of paradise on Earth!
I have been few times in Berchtesgaden Alps, but I have seen only tiny part of its wonders. I am going to go there again, especially, that my Watzmann ridge traverse didn't come into effect because of bad weather :(