NOTE: You MUST get a PERMIT for the main campus, by Hart House, so don't even try holding an informal wedding or anything resembling a wedding photoshoot, or the security staff will stop you. Alternatives nearby are Queens Park, or some of the little Annex parkettes. We used to use Grange Park behind the AGO, but it is also full of construction. To the west, we had a little wedding in Bickford Park (south of Christie Pitts), under a nice tree, tho we had to compete with Saturday morning soccer! Once again, just 6 people. You can't bring a large group.
Trinity Bellwoods still works, and Dufferin grove, tho you should ask the committee for larger groups than 8ish. In the East, you can take a small group to the bottom of Withrow Park or Riverdale, or some other local small parks. Don't even think of holding an elopement in the Distillery without a permit, tho. You can work out something with the Brickworks, and have lunch at Cafe Belong. Brickworks will want a permit and a fee for anything other than a small 'standing around-doesn't-look like a wedding' group. Be aware.
Northwards, there are little parks around Walmer, a nice little memorial park at Avenue Road and St Clair, and we've had little weddings in a few little community parkettes by people's homes.