I still plan on hiking in Canyon de Chelly. It is one of those places I've wanted to go for quite some time. That will probably be on Sun morning. Then I can drive up to Moab Sun night set up camp and get up early the next day for the Mt. Biking.
MSH...don't worry about keeping up. I will be riding at an enjoyable pace. I have very little Mt Bike experience. So what I have in fitness will be outweighed by my lack of technical skills! I am thinking maybe slickrock trail unless I get a recomendation of something better. It is somewhat legandary in the Mt Bike world.