Niagara Falls is about an hour and a half outside of Toronto and about 30 minutes outside of Buffalo, NY. It is about 3 hours away from the wedding venue. This is a beautiful place to go if you are coming early and exploring the area or staying a few days after to explore!
The CN Tower in Toronto is the tallest free-standing structure in the western hemisphere. They have different observation decks, a restaurant, and even the ability to walk around on the EdgeWalk.