The world famous Slickrock bike trail. While there is only about 300 feet in elevation difference from the lowest to highest point, do not let that deceive you. This is a rigorous test of your mountain biking skills, not to mention your fitness. Constant up and downs will both thrill and test you.
Once you reach the main loop, you have two choices, hard and really hard. If you want to take the "easier route, head to your left.
The entire course is well marked with painted white markson the rock. Mountain bikers also share this route with motorcyclists, so be respectful.