A friend of mine did a canoe camping trip that crossed into and then back out of Canada. At the border coming back into US, there was a sign across the river stating that you had to go through the checkpoint on the road above the river. The ironic thing was that there was no path up from the river - just lots of brambles and poison ivy. My friend climbed up and spoke to border control and after much discussion, they let the group continue on their way without all climbing up. Of course, this was back in the 90's before 9/11.
Kevin & Barbara
Thanks to the interstate highway system, it is now possible to travel across the country from coast to coast without seeing anything - Charles Kuralt