Depends on where you are comingf from. NYC Boston etc you could come into Canada through Cornwall or the 1,000 Islands border crossing. Buffalo could be equally as fast. Those coming from Ohio and over, it might be faster to enter Canada through Detroit/Windsor (3.5-4 hrs from Toronto)
There are three border crossing points near Buffalo. Buffalo/Fort ERie via the Peace bridge located downtown Buffalo. Slightly north, Niagara Falls crossing via the Rainbow Bridge or 5 miutes further north in Lewiston/Queenston. Once crossing any of these look for signs for the QEW Toronto. Stay on that road and it will bring you right into the heart of the City (1-1.5 hours from the border.)
I have travelled a lot through all these points. If anyone needs specific directions feel free to ask here or by email. [email protected]
Kismet