Colorado River Adventures: Most Enjoyable and Challenging Things to Do This is an infographic about the challenge and enjoyment one can get out of Colorado River adventure. It stretches for 1,450 miles along seven US and Mexican states and is popular for its rapid canyons and whitewaters delighting thrill seekers from around the world. It also has a Grand Canyon section and its waters are run by not less than 22,000 adventurers a year.