Toronto must do’s?

A small group of friends and I (4 total) are visiting Toronto in late April from central United States. Firstly, given the political climate, will we be welcome? We are also not in support of the current administration but we know tensions are currently high. Pending the answer to that question, what are some must do’s/must see while in Toronto? We are mid 20’s and more into nature/sights/food than shopping! We will only be there for three full days!