Found a discount in a Vegas To Go magazine. Took the bus tour to Hoover dam with power plant tour for two it was $90. Hotel pickup in a comfy bus and friendly driver. Even though we were told it would be 4.5 hours from pick up to drop off and it was over 5 hours, we enjoyed our tour. Got a little concerned in the end about getting back in time for the show we had tickets to but luckily built in enough buffer time between. The bus plays interesting facts about the dam and Vegas there and back.