Fantastic trek, well defined trails (for the most part). We did the upper trail loop... appx 6.3 miles. The climb was fantastic to to the highest point in the canyon. The climb down was steep, rugged and lots of lose rock. What got us was not the trek or trail but the heat. Do Not Do it in summer... the last mile back to the parking lot was the hardest because of heat. But the views and climb up and down were great.