Toronto is a short trip away from Ottawa, Montreal, and New York. You can drive, fly or take a train here, and follow the instructions below.
If you are flying into Pearson Airport, you have a couple of options to get downtown. Jump on the UP Express train which will take you right to Union Station in the heart of downtown, or grab a cab and ask the driver to take the 427 Highway into the city. If you are flying into Billy Bishop City Airport, just walk the tunnel under the lake and your at the foot of Queen Quay Blvd. Hop the streetcar northbound to King and your right in the center of the city.
Driving into the city, there are a few options to get you downtown. If your coming from the New York, Buffalo, Hamilton areas, stick to the Queensway until it merges into the Gardiner Expressway. This main artery will take you right to the York and Bay Street exits, and your here! If you are arriving from the Ottawa, Montreal, Kingston areas, you'll be coming in on the 401 Highway. Take this route until you hit the Don Valley Pkwy southbound, and then exit onto Richmond Street.
Taking the train will land you in the most central part of the city for your arrival: Union Station. From here, you can remain downtown or hop on the subway to get you to any northern part of the GTA. The bus will also get you right into the heart of the city, with major bus stops at Union Station and the Greyhound station on Bay Street. Either way, you can grab the streetcar or subway to get you anywhere you'd like in the city.