Explore the beauty and wonder of Grand Canyon South Rim trails and the awe-inspiring springs and waterfalls on the North Rim. Plan your journey along 1.7 billion years of rock layer to the wonder of the star-filled sky at night, we will provide you with a preview of why a recent visitors describe this trip as "One of the best and most memorable experiences in my life." REI instructors will discuss training and preparation for what's considered one of REI Adventure's most challenging adventures.