The Islands there are a nice and relaxing place to go for a day and there's no cars there which is great.
If you want a nice day trip, Niagara Falls is really good too, only three hours or so by train, iirc.
I can't really remember anything else from there, I was only there for a few days. You could try catching a hockey game at the Air Canada Centre if you're there for the season's start.
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