Crossing the Canadian border is usually quite routine and effortless.  You simply drive up to the booth and the custom officer will ask you a few questions.  Be truthful to the officer's questions and you need not volunteer any more information than they ask.
There is only a small chance that you may be randomly asked to pull your car to the side for a spot check by the officers.  Remember to bring your proper forms of ID and also a copy of your motor vehicle registration.
Be aware that if you have had a Drinking While Driving conviction you may be denied access to Canada.  Call ahead and work this out with the Canadian boarder.