Made a deal with an Austrian friend that if I showed her the best places in UK, she'd show me around places in Austria of my choice. Sounds like a lot of fun, and i have a vague idea where i'd like to go, but there's probably a lot of cool stuff i don't know about

So - outside of Vienna, Salzburg and Innsbruck, where in Austria is really fun to go? (or if a similar thread has already been done please link me to it?)

Cheers