Geeze WyoTraveler, he said he'll be staying at West Yellowstone. You can do the south loop on one day and the north loop on another from there. I usually spend 5 days to see most of the attractions. Consider seeing Bryce and Zion on the way down to the Grand Canyon. I would also stay a night at the north rim and then go down to the south rim. If your wife would like to check out indian crafts go out the east entry of the Grand Canyon to the little Colorado river where a number of vendors set up.