If you get a chance and have the cash, take the helicopter ride to the Grand Canyon. It is the ride of your life. It takes a few hours to get there and you fly over Hoover Dam and land on the floor of the canyon. Where they have a table setup with wine and cheese. They let you hang out there for about an hour where of course my wife had to smoke a joint (a lifetime dream to smoke a joint on the floor of Grand Canyon).
After leaving the canyon a few hours later, you are back in Vegas flying down the strip and then landing at the airport. I think it was about $1400 but...with 2 couples, it really isn't that bad of a price.
And of course, if you go to the Stratosphere, you have to go on the rides
I love when you wait in line for the roller-coaster and feel the tower shaking
The food was pretty good too. But, when they take your picture, be prepaired to pay about $40 for it