When you go to Calgary, go in July and don't miss the Stampede!!! Furthermore Calgary is a nice city with a laidback atmosphere. There are many students there, so always someone to have fun with.
Favourite spots:
Didn't spend enough time there to have a favourite spot.
What's really great:
The Stampede. I'm a citygirl and it was a lot of fun to walk around 'cowboy'world for a change!
Sights:
The Olympic facilities of the Winter Olympics of 1988.
Other recommendations:
Drive through the country around Calgary. The Canadian Rockies are beautiful!