Alison, Vegas was amazing, we used the little white wedding chapel I believe it's the one Brittany spears got married in, it was lovely. Staff were friendly, elvis was fab!
Everything there is VERY pricey, it's all aimed at tourists! We did the Grand Canyon flight and booked direct with papillon through there website, don't be tempted to save a few quid by flying from Boulder city, I beleive it's quite a trek to get there! Again staff were amazing, and even upgraded us from lowest fly over option to top package with champagne and limo, plus they gave us front seats for free!! The sellers on the street will tell you papillon don't fly from Vegas, but they do, it was a 5 minute limo ride from our hotel (Luxor).
I loved the volcano at the mirage, it's not spoken about like the bellagio fountains, but I thought it was just as, if not more spectacular. I also loved the gondola ride in the Venetian (inside) we had the guide Tao and he was wonderful, singing to us and stuff!
There are no such things as free vouchers, people will offer you some, but will try and sell you a timeshare, you never get the vouchers! Just say no and keep walking!
I did the zip wire down Fremont st, which was an experience!! And the mob museum was really interesting too. Oh my, there really is so much, just embrace everything.