We will be going to the Grand Canyon in May. Flying into Las Vegas and renting a car. I thought it would be fun to take Rt. 66 from Kingman to Seligman on our way to Williams. Can you tell me what the road and drive is like? 2 lane or 4 lane? Is it a lot a mountain driving? Scary with drop-offs? Also, how long does it take and what are some interesting places to see. Thanks for all your help.