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Much of the stuff in Berchtesgaden is closed for the winter. Salzburg is great, although some of it is also closed for winter, but you've been there. I'd also suggest driving the Romantik Road, but Neuschwanstein is part of it, as is Rothenburg,which is where the Castle Road crosses the Romantic Road.
If you drive north for about five hours, there are two stunning historic small towns in the former DDR with impressive Starwoods, both LCs IIRC. Look for the hotel named Elephant.