it's been a couple years since i've dealt with canadian/usa customs but my many experiences with them at vancouver have always been: piece of cake going into canada. their customs people are more like greeters or hosts-hostesses...never had more than, "business or pleasure...?" asked of me. but they would be a bit bossy...telling me to 'have a good day, eh!" and all that...

but coming home was ALWAYS a hassle...especially when i don't have my birth certificate! a driver's license, ccw permit, ss card...all that was never enough w/o catching grief...

good luck