I was in Las Vegas over the past weekend for business. I had a free day, and I took the half-day tour to the Hoover Dam.  I'm not sure why the other reviews are suggesting a delay at being picked up. I was waiting 15 minute early outside my hotel as they told us to, driver/guide was early, and we picked up a few more people! \n\nOur guide, Debbie, was animated the entire ride. She gave us a in-depth history of the Hoover Dam on the way there. Once there, she gave us a tour above the dam: history on the new bridge, monuments, spillover, drove us to the Arizona side, you name it! She also escorted us to the National Park Service part of the tour that included the video and to see the generators. It was a packed four hour tour, but it was well worth it! \n\nOne of the best day trip companies I have ever used!\n\nPlenty of water was provided throughout the entire journey to stay hydrated.