Not for the feint of legs, down is deceptively easy; coming back up is another animal. Amazing views as you hike down the canyon walls. Best to start early in the morning. NEVER attempt to reach the bottom of the canyon and come back up in the same day. Liza and Brad recommend trekking down to Cedar Ridge, seeing the amazing view, and coming back up.
Feel like trekking down into the canyon? Feel like dying on your way back up? This is the hike for you! It's hot and very, very steep. Take a water bottle or two (there are refill stations every so often). NEVER attempt to reach the bottom of the canyon and come back up in the same day.