Thank you!
Thanks for the prompt replies guys.
It look like westair have a 180hp C172 for rent, so I'll speak to those folks to see if 4 (non-pieeaters) without bags to KGCN is feasible. The $100 landing fee at Grand Canyon west sounds extortionate until I remember what I paid last time to land at Shoreham.
My friends are renting a car, so transport to and from the strip is no problem. I hope that the Vegas atmosphere doesn't get to them and end up in a pink Cadillac, or worse, a pink hummer.
Cheers,
Gareth.