Unforgettable is what you will say about Salzburg! The mountains are magnificent and the whole town is fun to explore. When there, take time to:
Eat at Saran's (mentioned in Rick Steve's book)
Take the SOM Tour (one of the smaller tour bus companies)
Go up to a concert at the castle
Take the Eagle's Nest Tour
Take the tram up the mountain
Wait!!! I know I forgotten several of my favorites! There are too many to list. Just enjoy the beauty of the mountains.