Vienna is a wonderful food town, and I have spent a bit of time wandering the Wiener Wald, sampling wine and hiking up and down hills, but I have not been to Salzburg. If you do make it to Vienna, hit the market, and buy a few sausage sammies, with some beer. Then head into the hills to eat the plebeian, and usually mediocre food in one of the wine halls, gulped down with immature and mostly astringent wine (the white is always better than the red, which is not saying much). Okay, you can skip that part, though for some reason I do it the first or second day when I go.
The Hapsburg's various museums in Vienna are worth 2 or 3 days if you can spare them. Lots of spectacular stuff plundered from all over the world over the 200 years Vienna was the center of the world. It is an interesting architectural town too, the home of Hundertwasser Haus, which is wonderful and he was a facinating guy, and the Central Post Office is an interesting exercise in early 20th century modernism.
Eat game - boar, venison, etc. - and sausages, and drink Blaufrankisch, Zweigelt, Riesling and GV wines. And haul a few cases home with you.
I have also enjoyed excellent Spanish, Mexican and particularly Czech food in Vienna. They take their food seriously. In fact, I think the best Wiener Schnitzel I ever had was in Vienna. Coincidence? I doubt it.
Some friends of the Bride have a condo near Salzburg - I think we need to work on cadging an invitation. Thanks for reminding me. Great idea for a trip.
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Feeling (south) loopy