I grew up outside Niagara Falls, NY (North Tonawanda), and still have 2 brothers in the area (NTSammy5 being one of them). Whenever we go back to visit WNY, a trip to Toronto is a must for me! I love the Zoo & the Science Museum & just to wander around Young St.
When I was a kid my father used to take us up to the Sportsman & Outdoor Exhibition - which was always exciting when you are 7-12 years old. I loved watching the dog field trials in the arena. I think this was held in the CNE Complex - but I'm not even sure that complex is there anymore.
Also, the day after our high-school's senior prom a day trip to the Toronto Islands was a tradition. You either went there or to Letchworth State Park in NY.
I haven't been to Toronto since the mid-90's. I think I'm over-due!!