Last year I splurged on a helicopter tour througn Papillon (sp?) from LV to the Grand Canyon. We flew about 30 minutes over Lake Mead, the desert, Area 51, across the Canyon, and then landed at the bottom of the canyon by the Colorado River where we stayed another 30 minutes or so, and enjoyed a champagne lunch. It was an amazing experience. Somewhere we had a coupon for $100 off, but it was still pricy.
We have also taken a helicopter down the Strip at dusk when all of the lights were starting to come on. We flew straight down the Strip, over the Fountain show at the Bellagio, Downtown and circled back to the airport. The ride was over very quickly. We were herded on and off the copter within minutes to make room for the next riders.
If you are ever at the Rio's outdoor Voodoo Lounge at sunset, you can see the helicopters flying by - almost at eye level - one right after the other lined up in the sky. They have to get as many rides in within a short time, I guess.
Hope you have fun!