Tatshenshini River; Alaska, British Columbia, The Yukon

There are many great international river rafting trips, and one of the best is unsurprisingly a Canadian-Alaskan crossover. Hatha Callis, owner of Skeena Valley Expeditions in British Columbia, recommends this relatively calm 10-day trip closer to home. "It runs through the planet's largest UNESCO World Heritage Site, and two national parks and one provincial park. You'll see the world's largest non-polar ice caps, lakes full of icebergs, as well as glacier bears, grizzly bears and bald eagles. And you can drink your evening scotch with 10,000-year-old ice." The Tat also incorporates layover days for great hiking.