If you want to see the most wonderful scenery in America, then I suggest you take a helicopter ride over the Grand Canyon. The feeling you get from hovering above the canyon is quite amazing.
During a holiday to Las Vegas with my husband we were able to witness a storm which passed across the canyon. To stand there and watch the forks of lightning crossing the sky was quite magical, especially when you're standing in hot sunshine on the other side.
For the more romantic of you, there is an option to actually land in the canyon and have lunch over looking the truly wonderful scenery.
During the flight back you fly over the strip which is lit up in all its glory. All I can say is "wow". This has to be one of those trips you certainly have to make in your lifetime.
You can get a trip to the canyon from most tourist shops along the strip, or your hotel will have information.