Art Gallery of Ontario https://ago.ca Was there a few years ago. Mostly artwork upstairs, large ship models downstairs. A bunch of various other exhibits.
Ontario Science Centre https://www.ontariosciencecentre.ca/
CN Tower/Restaurant https://www.cntower.ca
Ripley's Aquarium of Canada https://www.ripleyaquariums.com/canada/
Niagara Falls https://www.niagarafallstourism.com/ Huge waterfall and tourist trap about 130km from Toronto. I've been there once before. October is a bit late in the season for watching idiots attempting to survive going over the falls but will also be much less crowded. Could rent a passenger van in Toronto (10-12 people) for $200-$250 for a 6-hour day trip. Anyone with a valid USA or Canada driver's license can drive it. http://reservations.holidaycarrentals.ca
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Jeff Hanson