Cannot believe I've been living in Las Vegas for 16 years & just found out about this amazing trail. We parked at the Hoover Dam Lodge & entered from their trailhead. Go right & turn right onto the main trail. The 5 tunnels are awesome. We hiked all the way to the Hoover Dam & back. My Fitbit says it was 8 miles round trip but didn't seem that long. Took around 3 hours total. Amazing views of Lake Mead. It's a must do for the kids. Mine were 13, 9 & 8.