Hi MK1,
You WILL get used to to the cold, although be prepared - it often gets down to -30 degrees celsius in the winter. I'm not trying to scare you, it's just the truth! Also, since Calgary is in the foothills of the Rocky Mountains, we get warm winds called chinooks that will warm up the temperature considerably, although many people suffer symptoms such as achy joints and migraines during the chinooks. It means that it might get to -30 in the winter, but it doesn't stay that cold for very long!
There are plenty of great things to do in Calgary. There's the Glenbow Museum, the Nickel Arts Museum, which is on campus, lots of shopping, great parks with events like live music, food tastings from local restaurants (these last two are always in the summer and are at Prince's Island Park just outside downtown), you can go to Canada Olympic Park and take a skiing or snowboarding lesson, or go on the luge there, ummmm, what else? Dinosaur National Park is nearby in Drumheller, there are live music and plays at the Jubilee auditorium. There are lots of great cafes - they range from the usual Starbucks to some neat places in the Kensington area of town, such as the Roasterie. Speaking of Kensington, there are a lot of cool pubs and restaurants there too (and it's fairly close to the Sunnyside C-train station, which is only 4 stops from the University). For pubs I really like Molly Malone's, the Kensington Pub, and Original Joes, all of which are in Kensington. The Marda Loop area also has some cool pubs, although I'm not as familiar with that area. The drinking age in Alberta is 18, so you should be set! Oh, there's also a Farmer's Market at Currie Barracks (the former location of Canadian Forces Base Calgary) and there's also the Wild Rose Brewery, which makes excellent micro-brew beer (try the Wild Rose Wraspberry!) and also acts as a pub. There's a really fun wine tasting event every October at the Roundup Center in Stampede Park. It's called the Rocky Mountain Food & Wine Festival. I highly recommend checking it out. You get to sample all sorts of wine and food from local restaurants. There's also the Stampede, but that's in early July every year. It's world-famous and a lot of fun. There's chuck wagon races, horse racing, a carnival, and the whole city celebrates for 10 days.
As for the campus, it's pretty big but I have to say that you'll probably stick to just one part of campus. There are whole parts of it that I only go to if I'm going for a walk or because I want to explore. There's lots of construction on campus right now, although some of it will be done before you get there. The Taylor Family Digital Library and the EEEE building will still be under construction when you get there. A lot of campus is kind of shabby and run-down looking, and the classrooms are sometimes not the best. What program will you be in? I can probably tell you what part of campus you'll likely be in.
I definitely enjoyed studying at U of C. I got my BSc in Computer Science there, and will be finishing my MSc in the same soon. I have to say that the faculty are pretty great, at least in CS and in Math, which is where most of my classes were. I also took some great classes in the Military and Strategic Studies field. I'm going to miss it, but it's time to move on! The campus is very busy and lively during the Fall and WInter semesters - there are around 30,000 students registered at U of C.
I'd be happy to answer more questions if you have them