Went there years ago. Did a helicopter tour from the airport at GC. They give you a number equating to where you sit in the machine. I think they might even weigh you Mostly OK but if you are middle seat at the back then a bit dissapointing. Was good to see and say that we'd done it. I think there is also some sort of old prop driven aircraft relic down the main road near it for anyone who is into these things, at least there was back in 2003. Have a good one!
PS Agree Hoover Dam is pretty spectacular too!