Every time I've headed up that way, it's been easier to get back into the States than getting into Canada. They are strangely very picky about youthful indiscretions involving cops and arrests. If you have a police record, they will most likely not let you in the country. We about got the bad end of that heading up there last summer when our chase truck driver had his ID run and they started playing 20 questions with him about a DUI form 10+ years ago.