The rafting season is relatively short, but the thrill of careening down a river laced with rapids is not easily forgotten. Qualified guides operate on many rivers flowing out of the mountains. The Kicking Horse River, which flows through Yoho National Park [1] to Golden [2], is run by companies based in Golden [2], Lake Louise [3], and Banff [4]. This is the most popular river for rafting trips.
The Sunwapta River in Jasper National Park [5] and the upper reaches of the Fraser River through Mount Robson Provincial Park are others offering big thrills.
For a more sedate river trip, try the Bow River in Banff National Park or the Athabasca River in Jasper National Park. Both are run commercially. All companies offer half- and full-day trips, including transportation, wet suits, and often light snacks.
Links:
[1] http://www.moon.com/destinations/british-columbia/southern-interior/yoho-national-park
[2] http://www.moon.com/destinations/british-columbia/southern-interior/yoho-national-park/golden
[3] http://www.moon.com/destinations/canadian-rockies/banff-and-jasper-national-parks/lake-louise-and-vicinity/lake-louise
[4] http://www.moon.com/destinations/canadian-rockies/banff-and-jasper-national-parks/town-banff
[5] http://www.moon.com/destinations/canadian-rockies/banff-and-jasper-national-parks