A rafting trip down Colorado River, and particularly the Grand Canyon, is truly one of the top white water adventures in the world. Breathtaking scenery combined with wild white water make for an unforgettable experience. As Arizonaguide.com points out, rafting in the Grand Canyon enables visitors to explore its geological wonders through the very source of its creation, the Colorado River.

"The Grand Canyon section of the Colorado River runs from Lees Ferry to Grand Wash Cliffs, and those looking for a real white water adventure can raft the entire 277-miles. Featuring an amazing 161 sets of rapids, the complete trip takes as little as six days in a motor powered raft or up to 22 days under oar-power." Note, however, that the popularity of the experience means that one must plan and book this adventure several years ahead.