Hi,
learn just a few words of German. It's nice to be able to at least order lunch.
Ein bier, bitte!

I loved Vienna. Research Vienna carefully, plan on spending a day or two there.
Things to do. Sit outside and sip coffee or espresso at a cafe and watch the city roll by. You really should try to catch some classical music there. It's the only place in the world where I want classical. They have a light and magical touch with music. Try the local spring wine, it's very pleasant with lunch; maybe with some Hungarian Goulash (the Viennese version of Goulash is excellent). Austria has some of the worlds best deserts. Got to the Cafe Sacher and try the Sachertorte.
I have heard there is some hostility towards Americans, you might want to practise your Canadian accent ( Beauty, eh?). If you see Trockenbeerenauslese on the menu, order a glass ($$$). Vienna has great parks, I was not impressed with their museums but that was 30 years ago. Their rum is considerably more potent than ours. I learned that one the hard way, and more than once