Motochick:

Only do sedona to Flag early, early in the morning - it's not bad then, but give yourself plenty of time to get up and get up early cause it is really narrow and winds around a lot at the top. It is populated mostly with tourists and they don't pay to much attention - their looking at the scenery too much!

I would suggest a week day morning, but I drove down it a couple of Sundays ago and it was really deserted then as well. But it was very early.

spoke from Flagstaff