Also, you can leave Canada pretty easily since much of the populated part of the country, and much of the country that has roads, is within a few miles of the US border, so you can pop back and forth thereby refreshing your entry date, or cutting off corners. For instance when I rode from Toronto to Halifax, I was pretty much within 20 miles of the US the whole way, a few exceptions, but not a bad generalization, until I crossed through the middle of New Brunswick..