Surveillance and tolls if you use the interstate highway, but there are other roads. And as for crossing the border? Lots of places. There are old logging roads from VT to ME that still cross over from the days before there were borders. There was a time when people owned property on both sides and old roads and driveways still exist. Not to mention, you can just walk across, there aren't any fences. Hunters frequently do both sides of the border. Age of consent is 16 in Canada. Not saying this is the case, but it's another hmmm.