athletics? lol

brush up on that portfolio. universities don't care about sports unless you're lebron james. in which case, you definitely won't have time for studio. that being said, Andrew Luck majored in architecture at Stanford. 

Universities typically want someone who has excelled academically while showing leadership in other areas, which can include sports.

That said, you should probably join a volunteer organization and try to attain a leadership position in it. Think Habitat for Humanity, Doctors without borders, Students for Sensible Drug Policy, or the like. This will rate much higher than playing basketball.

Also, if you really want to be an architect, find a local firm and try to intern there over the summer and winter breaks, as much as possible until you graduate. You should probably also get an after-school job, not only to show you can deal with multiple conflicting commitments, but to start conditioning your body and mind for the gruelingly excessive work of architecture schooling and practice. Meanwhile, the $7-10/hourly pay will condition you for what you can expect after graduating with your shiny new Master's degree.

School's want the whole package, and the good part is that even if your parents aren't rich, they will still loan you the obscene amounts of money necessary to attend. Indentured servitude never looked so good!

In the States when I was younger we used to joke that the worst basketball players here had Canadian parents. Admissions don't care if you're the captain of a basketball team in Canada. Reallly, the only two who care are Steve Nash and Drake. For real, you chose that over hockey?

With that said, I was an athlete in high school and didn't worry about that hindering my 3.6 gpa, nor am I ashamed to have spent some time in sports instead of studying (because I still got into a fine university that wont defect my search for potential graduate programs). I wasn't the best or most committed athlete though, but I was the smartest, and that's really the most important facet after you get your high school diploma. Lastly, the social skills you develop as the captain of a sports team will be utilized the rest of your life and they're important skills to learn.

One of my best friends growing up was the captain of our high school's basketball team, and got worse grades than you, but was still admitted to University of Wisconsin, which is probably comparable to McGill. Ball out, kid. But put hockey sticks in your kids hands when the time comes.

lots of really interesting research regarding success in sports and "success in life."  Not sure how much it matters to university admissions, but I'd play up the leadership and personal development aspects that come with being a captain.  I suspect that many admissions types wouldn't know a basket ball from football.