We opted not to take the long drive out there, and instead paid $250 per person for an air tour.
We flew a scenic airlines propeller jet.. (the plane seated about 16 people, i think). Took off from North Las Vegas airport. The plane had huge windows so you could see the scenery. Flew over Hoover Dam and other scenic locations. Flight took about an hour. Very turbulent (in my opinion), due to the heat rising up from the ground. Landed at the west rim of the Grand Canyon. From there, we took a short helicopter ride down to the bottom of the grand canyon. It was 115 degrees at the bottom. We had about 20 minutes to explore. They provided us with water and champagne. Took some fabulous pictures, then hopped back into the helicopter up. From there, a short bus ride to an Indian Reservation, where we had a nice bbq lunch. Took some great pictures, talked with some of the indians there.. bought some jewlery. Then we took the bus back to the air strip and boarded the plane back to las vegas.
All in all, the trip was worth the money. It took 1/2 day. The Grand Canyon was absolutely beautiful and breathtaking.