An American couple was on the St. John River Wednesday in a pair of sea kayaks, on the last leg of a three-year journey from the Pacific Northwest to the Florida Keys.

Dave and Amy Freeman have already travelled to Alaska and the Northwest Territories by canoe and dogsled, back south to Minnesota, and down the St. Lawrence River to Quebec.

But as the CBC's Roy Gjelstad learned, it's not just an adventure, it's their non-profit business — a wilderness classroom linked online to inner city classrooms.