We did the full tour including power plant and inside the dam. Fascinating information about the design and construction of the dam. This is something everybody with any interest in human accomplishment or engineering should see. May be a little tough on those with claustrophobia or fear of heights, but suck it up and go! BTW - there is no door in the face of the dam like Chevy Chase found, but there are louvered access panels to the inspection tunnels which you can see. No dam bait on the dam tour, so leave cousin Eddie at home. Also, arrive early. This is a popular destination and the tours sell out quickly, get there before noon.