Experience Jasper's Athabasca River Mile 5 run! Enjoy the beautiful mountain scenery on this 2-hour round trip adventure. The Athabasca River Mile 5 run is a perfect introduction to white water rafting, has plenty of splashes and stunning mountain vistas. It is a must-do family adventure in Jasper! Adventurers must be at least 5 years old and accompanied by an adult.