I spent a week in Toronto two years ago exploring by myself during the day while my husband was at a conference. I had lots of help from Mumsnet with ideas of things to do. Some of my highlights were -
Royal Ontario Museum- there was a great exhibition on at the time.
Cycle tour - this was a great way to see the city.
Distillery district - lovely independent shops and coffee shops (try Arvo)
Blue Jays game - we definitely benefitted from watching a couple of games on TV beforehand and looking up the rules.
Trip to Niagara - I used Niagara Day Tours. They use minibuses so can get closer to the falls - apparently large coaches have to park further out at the coach park so a longer walk to the falls. It also stopped at vineyards for tasting and Niagara on the lake - beautiful.
Walk down Queens Street with brunch at Lady Marmalade - amazing Eggs Benedict but often a queue especially at weekends.
Walk through Cabbagetown
St Lawrence Market- have a peameal bacon bun /poutine
Loose Moose bar (near blue jays stadium) great food.
Steam Whistle Brewery tour - think you might need to book in advance- was very good.
Aquarium - really impressive
Walk along the boardwalk/beaches
Go underground and explore the PATH system. Huge underground system that is beneath the centre of Toronto. Lots of shops and restaurants down there.
Loved my time there. We are going back for a few days at the start of our holiday next year and I’m looking forward to taking the rest of the family to some of these places.