Although a bit of a trip at 180 kilometers (112 miles) southeast of Munich, Berchtesgaden is a must for nature lovers and for anyone interested in World War II history.
The east face of the imposing Mount Watzman (the third highest mountain in Germany) is a rock climber's dream, while the Königssee, a glacial lake off-limits to motor boats, is majestic. There are a number of short hikes from the various information centers within the park, while there are two more challenging hikes of note that reap natural rewards. The first is the the ascent of Bindalm from Hintersee National Park information point, a 7.5 mile trek (12 km) that is also popular with mountain bikers. The second is the journey to germany's highest waterfall, known as Röthbach Waterfall. Cross Lake Königssee via boat to Salet and then make the ascent to Lake Obersee, which is where you'll more than likely have views of the 470 meter (1,540 foot) falls. If you've got the full day and a packed lunch, tramp your way up to the top for a true off-the-beaten-path experience. The Berchtesgaden National Park website has more information on adventure activities.
For World War II buffs, there is Eagles Nest, located above the town. This was Hitler's mountain hideaway during his dictatorship and today can be accessed on foot or by bus from Berchtesgaden. Make sure you have a good two days in your itinerary for Berchtesgaden; it's unforgettable.