Best part of our Vegas trip.....Outstanding. The 12 mile kayak trip is the one to take. It provides opportunity to see so much (walk in a natural sauna, dip in a natural hot spring spa, jump into ~55 degree water, see the Hoover Dam from water level). Guides were great. Pick up from you hotel. Lunches were good. Everyone was there to help you have a good time. The kayaks were high end which made the paddling a breeze.
I would recommend Evolution Expedition to anyone.