The thing about the grand canyon is that its really neat up close and over time. Watching the sunrise was fantastic. Not only did the light change from time to time but the actual color. And with each change the bumps and hollows of the cliffs changed. Unless you want to just be in awe of the deepness of the canyon at each turn, I'm not sure what the bus would do ... although - did you go and walk over the glass thingie that justs out over the canyon. I saw a movie about it and evidently you can see straight down.