First off, our driver (Angela) was fantastic - very informative and managed to get us all back to our hotels by the stated return time, considering a major delay on the freeway coming home. (She knew all the back streets). As for the Hoover Dam? - very interesting. Our tour guide at the dam, (J.R.) answered all our questions and gave us plenty of time to wander around the power plant and take photos etc. Back up top, it was VERY hot, so be aware of this if you are booking the tour in summer. (Try for an early morning tour if possible). Lots of restrictions regarding just what you can take with you off the bus. No car keys, or sharp objects and basically boils down to just your cell phone/camera and some water. There is a small shop and overlook on the Arizona side, but most of the "development" is on the Nevada side, with a large gift shop plus refreshments, as well as the information center. Don't worry about the photo op as you start the tour. It's expensive and only worth it, if you REALLY like your photo (They photograph you in front of a green screen). There are plenty of opportunities to do a 'selfie' at the dam. Highly recommended day out - a day away from the manic vibe of The Strip. (Good value too, when booked thru Tripadvisor!!)