Don't do it! I've been waiting for this shuttle for 45 minutes. The guy keeps saying it's almost here, and nothing. Time to cab it. I made the mistake of paying for this with my flight/hotel package.

The ride back to the air port wasn't much fun either.

Waited 45 minutes for the shuttle.  When we called to find out where the shuttle was, the operator didn't even apologize; she just told us another 15 minutes. When we finally got in the shuttle, the driver went through two red lights. :-(

As a travel agent, I was completely appalled at how they handled one of my clients booking for a Grand Canyon Tour. Firstly they couldn't find his reservation that I had made when he called to reconfirm 24hrs prior. After I called and gave a little bit of hell- the agent proceeded to tell me the tour was booked for the date that I booked my client on and that he would have to change his dates! Hello! My client was only in Vegas for 2 nights!
All and all, after going back with Showtime tours, the agent there pretty much told me the tours were cancelled and my client was screwed SO I told them to cancel and process a refund, in which the agent said "FINE" and hung up on me...
Needless to say, the next 4 Grand Canyon Tours I've booked all have gone to another local company...

I would give them ZERO stars if I could but STAY away from Showtime Tours they are not worth the time...