I didn't stop and figure mileage and driving times, but my educated guess is that if you really want to see these areas, two over the three days would be the maximum. You can do the drive in three days (to all three), but that won't leave you very much time to relax and look around. If I had to choose myself, I'd pick the Canyon and Zion, and leave Monument Valley for another time. This is simply personal choice, having been to all three places. All that said, realize you can spend several days in each of these places and still have more to see. Bob