The Grand Canyon is definitely one of the most breathe taking wonders of the world. The orange rust colored rock and huge chasms that reach down to the heart of the Grand: The Colorado River. The Colorado is a very popular and dynamic river. Of course since this river is one of the most popular rivers to raft many guided trips must be scheduled a year or two in advanced! Much of the Colorado River classifies as class IV-V although there are pieces that are class II-III.
I would run this river as a customer or as a tag along on a friends trip. I have no desire to ever run this river as a guide. Granted you never know what will happen in the future, but I highly doubt guiding down the chasms of the Grand Canyon are in mine.