First things first, get the Salzburg card. It's around 27 euro per person, but it gets you into multiple museums, the fortress and to the top of the Untersberg. We only had one full day and it was worth every penny.
Once you have your card take the bus to untersberg and enjoy an hour or two at the top. The views are top notch. There's a couple small restaurants up there if you want to have a drink before heading down. This is a no brainer, even tho it takes a little time to get there.
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