How do English-speaking students in McGill find extracurricular activities outside of school?

So I am in Grade 11 and I am trying to narrow down a university to go to in Canada. I plan to go to Harvard Law School after my undergrad and I know that it is a very competitive grad school. This means that besides my GPA and test scores, extracurricular activities and achievements are critical.

I am thinking of going to U of T or McGill University. Since I live in Toronto, I kind of want to live far from home. Anyways, I am just asking English-speaking McGill University students on how are they able to find extracurricular activities in a French-speaking city like Montreal?