Great experience if you're vacationing in Vegas. If you really want to see the Hoover Dam(I mean really), then you've got to go kayaking on the Colorado like we did.
You simply rent a kayak/canoe from them, and they let you kayak from the base of the Hoover Dam all the way down the Colorado.
Tip: Don't get the two person sit on top kayaks because it takes more power to get it going.
You can also get other gear from them if you want to go camping. Its really cool, you can bathe in Hot Springs and hike quite a bit. It's beautiful.
Another fine review by S.G.
Whoop, whoop, whoop!