That's the airfield clearfinals. 9000ft long, and for good reason. Don't know where you are staying, but call them up and they will come get you. Remember to add sales tax to the price of the flight. You need a special permit to descend below the rim nowadays, started doing that a few years back when a helicopter ran into the canyon wall.
Only place I've experienced proper severe turbulence for extended periods, even the tour companies will whine on the common frequency when it's that bumpy. Very unpleasant indeed, once seriously considered putting it down on a road as the passengers were petrified (private flight, 182), impossible to get above without O2. Surface winds made that silly idea completely out of the question anyway, and we just headed on...