Just buy a travel adaptor which you can probably pick up in Boots, Tesco, the airport....it will specify the region of the world so look for North America.
If you check the details on the chargers /adaptors you wish to use, it will tell you what voltages will work with this device.
For example - my Samsung mobile phone charger works from 100V - 240V (and Canada uses 110V I think) so all I would need for this would be a plug adaptor, this sort of thing:
http://www.cableuniverse.co.uk/catal...ebd39a3f6012c6
If any of the appliances you wish to use demand only a certain voltage (230V) then you will need a voltage adaptor which I believe is a more specific item.
But from past experience (been to Canada twice) I have used a standard 'plug adaptor' sometimes called a 'travel adaptor' in the shops, with all my rechargeable goodies, and had no problems.
Hope this helps a bit!
PS Toronto is AWESOME, we absolutely loved it! Make sure you get up that tower, I recommend going early in the day because after 10/11 am all the coachloads of tourists arrive, you have to queue for the lifts for an hour and a half!!! Go up on Saturday morning at 9.30am, get breakfast (I recommend waffles with fresh strawberries and cream) and look out over a wonderful city!