My buddy is a special officer for Toronto Police - he said that security will be ferocious around downtown Toronto, as heads of states of the most powerful countries will be there. The secucurity cost have now reached 1 billion canadian Dollars, so expects massive hassles in the area. Another blogger said to avoid the area, I would only travel/stay in the distant suburbs if absolutely necessary to be in Toronto at the time (June 24 - 29th)