It's cold out there. The Ice rink at City Hall, High Park, the island, cherry beach in winter - all COLD, people! Red noses! Brrr! Consider splurging on a great hotel room, in one of the icons: Park Hyatt has great suites (here's a pix from their website), and the Royal York is a bit tatty, but still has some good windows, or of course you might choose the hipper Gladstone or the Drake. Or try the Hilton, or one of the new boutique hotels like St Germain.
Make sure there is enough ROOM, tho - some of the boutique hotels only have room for that great bed, and nowhere to stand. So do your research, or ask the staff for a room with a VIEW or with room to entertain.
Then hold your small wedding in your room, and sign the license on the fancy table and order room service. You can always arrange to go down and take wedding photos in the lobby and in the entrance afterwards.
We had a nice little elopement wedding at Sutton Place this winter for a couple from out of the city (meaning they came in from Mississauga and survived the trip). Just order a few flowers, and bring a some gravlax and champagne, and have a wonderful winter wedding.