What is there to do in Toronto?

I'm heading up to Toronto to visit family for spring break, and I was curious - what is there to do?! I'm a teen girl, so if there's some magnificent mall, that would tide me over for a few days. I've never been to Toronto (or Canada, for that matter) so, although I have an undying need to shop, a mall would not keep me entertained for 6 days. My 20 year old brother will be joining me, so something that will entertain us both would be greatly appreciated. Also - restaurants! My brother and I are adventurous eaters, so ANY type of awesome restaurants would be amazing! Thank you for your help!