Maclean's magazine releases comprehensive evaluations of Canadian universities annually. Not only can you review which universities have the best overall reputations, you can learn how students feel about their university experience and how the university performs in certain key areas, such as student-teacher interaction and offering academic challenges. Much of this information is available free online.
If you're not sure what you want to do when you finish university, look for schools that help you find opportunities to explore what your degree can do for you, either through formal co-op programs or career services centers that help students find summer work and internships related to their degrees.
After you've narrowed the field of choices through some independent research, visit the campuses. Admissions offices give guided tours for potential students, so take part in these sessions to get a firsthand look at what universities offer. Campus vibe and culture, something that you can only understand by visiting a university, is sometimes the deciding factor when choosing a school.