When I visited Queen's I noticed that the vast majority of people there are white. It didn't seem very racially diverse to me which put me off, but I also didn't like Kingston, and their life science program isn't that reputable in my opinion (feel free to disagree). However, Queen's has a beautiful campus which is right beside lake Ontario, which is one thing I liked. I also felt like I wouldn't fit in at Queen's which is why I'm not considering Queen's any more.
I've never visited uOttawa but I've visited Ottawa and I really liked the city; it's bigger than Kingston and there's so much more to do since it's the nation's capital.
I think you'll have equal opportunities to get involved at either school, Queen's seemed like a very extracurricular-focused school but I'm sure Ottawa has great opportunities too.
Based on what you said I think uOttawa would be better for you; you may meet Korean people at uOttawa but you'll meet so many other people of different races in Ottawa.
But also consider the programs; do you like computer science or science more?
McGill Class of 2016