Ontario Border Crossing Regulations:
The video below is an interview with an Ontario Customs agent. He talks about a wide range of things including how much beer, liquor and tobacco you can take over the border. He also talks about proper identification, prescription drugs, pets, food, worms, salted minnows, and their right to inspect what you have in your vehicle.
Even though Canada does not require a passport to enter Canada You MUST HAVE A PASSPORT TO GET BACK TO THE US.