Cool stuff to do with my niece, a new immigrant?

So I have a niece who grew up in Hong Kong but is coming to Toronto, Canada (where I live) and staying with relatives to finish high school and university. She’s 16-ish (I’m mid-20s), the horrible age of anti-everything and I want to do cool big-cousin stuff with her.

I know she’s been into fashion and athletics (track and field) in middle school but that’s all I know. What is some cool young-ish stuff that the ‘adults’ wouldn’t necessarily think that we both wouldn’t hate doing? General or Toronto-specific ideas both appreciated.

i.e. She likes that weird boy from High School Musical but I’d rather swallow his DVD than bring her to one of his appearances.