This place is crazy and weird.
Think of a giant desert, then put a huge lake and marina right in the middle of it. The views coming down to this area are insanely beautiful. Once here, you'll be struck not only by the surreal beauty, but the eery silence.
Sure, there's not much to do here except take pictures, feed the fish some popcorn (see Feeding Carp at Lake Mead on YouTube) and perhaps grab a quick bite to eat.
This place is a great pit stop on the way to other things. And if you like weird America, it's a must-see.