I recommend keeping the ring in your pocket and looking at "all" of these suggestions made here, then at the appropriate time and place....ask her
My suggestion is to go to Fire valley state park (google it!) which is about a 1 hour drive from Las Vegas (slightly less maybe), drive into the park and drive until you see the welcome center (not the booth where you pay to get into the park -the welcom center). There is only one raod so it will not be too hard to do.
This is the important part.....there is a road beside the welcome center, that you have to go into the parking lot of the welcom center to get to, that goes into the hills "behind the welcome center. Within 5 minutes of going into those hills you will lose your breath as to the beauty that you will see.
My last trip there in April, 2 limo's pulled up at 11am and held an actual wedding (gowns, tuxes, Limo, the whole 9 yards!). The back drop for pictures could not be more perfect.
Good luck .....Weggie