To eat and drink:
1) Drink a glass of tap water. The water in Vienna is much better then in many other cities.
2) Eat a Sachertorte. It is one of the best chocolate cakes in the world. (You will get the original
kind of it only in the "Hotel Sacher".)
3) Eat a Wiener Schnitzel.
4) If you are a vegeterian, you could eat a Apfelstrudel (The Apfelstrudel is a dessert!) instead of
a Wiener Schnitzel.
To visit:
5) The Schönbrunn Palace.
6) The Hofburg.
7) The Stephansdom (St. Stephan's Cathedral or, how the Viennese call it, "Steffl").
8) The UNO-City. I was just once there and it was really fascinating.
9) The Wiener Prater (It is a big park. Don't mix it up with the "Wurschtelprater", that is a fun park!)
10) The Riesenrad
Other things:
11) Go through Vienna and keep your eyes peeled!
If you need help, just ask somebody, most people in Vienna speak English with you (If the person you ask doesn't speak English, ask a pupil who turned already twelve, they understand English!)
The offical Website of Vienna: http://www.wien.gv.at/english/When I am away from Vienna, I most miss the wonderful tap water.

