Tour guide was excellent - personable and explained a lot of history regarding both the Hoover Dam and the Las Vegas area in general. We were able to walk along the Mike O'Callaghan-Pat Tillman Memorial Bridge which overlooks the dam and the Lake Mead overlook area. However, although we drove over it, the biggest let down for me was the fact that we were not able to walk on the actual dam itself (which is why I rated 4 stars). Still, for the cost, I'd say the tour was worth it for the convenience of being picked up and explained the history behind it all.