3 days in Vienna is definitely plenty, but a trip to Salzburg would be too much. My advice would be to rent a car and drive an easy hour to the Wachau Valley. Depending on your preferences, you can visit the old monestary in Melk....or, there are several nice vineyards along the banks of the Danube with tasting rooms and small restaurants (Some are quite good.) Also you might consider one of the really excellent fine dining choices in the area for a mid day meal followed by a long stroll along the Danube - There are walking paths everywhere!
PS- I've just returned from Vienna and can recommend the outdoor terrace at Le Ciel for dinner.
Thanks for all the information. That sounds great. A definite option.
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