Road Trip - Scenic Route Suggestion (Toronto - Niagara - New York - Boston - Montreal - Toronto)?

this is kind of tough for that specific order you want to visit..for example, if you reversed boston and montreal so that you are going FROM NY to montreal you can take I-87 north from NYC which would take you right through the Adirondack mountains of NYS--you would see the adirondacks on your left and the vermont mts on your right