Mittenwald has numerous hiking trails. One of the best is to the Kranzberg and then further on to the Lautersee and Ferchensee. Finish up at the Mittenwalder Postkeller. Details in Rich Carbonara's book Beer Hiking Bavaria.
The Fichtelgerbirge area offers great hiking, food and beer. What's not to like?
Not far from Munich, Kloster Irsee is a great off the beaten path beer destination and walking there gives you views of the Alps and the Bavarian countryside.