A Las Vegas Kayaking Experience Unlike Any Other 20 years ago, Evolution Expeditions pioneered kayak tours to Emerald Cave, before any other operator offered them. What started as a small crew of paddlers who knew this stretch of the Colorado River better than anyone has grown into Las Vegas' most trusted outdoor adventure company. We're still based in Boulder City, still run by people who love this river, and still focused on the same thing we started with: getting you safely onto the water below Hoover Dam for an experience you'll talk about long after you're back on dry land.