Take highway 78 west when you get to Swanton off I-89 (very near to the Canadian border) and then turn right when it intersects with highway 2 (at the gas station). There are three or four turnoffs within the next 30 miles that go to Canada - north of Allburgh, Champlain, Rouses Point, etc. They're all two-lane highways with one open window for customs. The lines can be just as long as at Champlain (I-87) or Highgate Springs (I-89) since it is the one line, but I still enjoy them more than the parking lots on I-87 on a bad day.