Camping in Lake Mead NRA near Hwy. 93?

Traveling from Grand Canyon to Las Vegas airport, then to Zion N.P. Want to pitch a tent somewhere so we have an easy morning drive to the airport. I see campgrounds on Lake Mead, but better would be somewhere close to the highway, maybe along the river below the dam. Any suggestions? How about Boulder City, NV? Might we have better luck finding a campsite on the Nevada side?