they do have small little hairdryers in the rooms, but my experience has been that they don't work very well. If you have short thin hair you would probably be fine, but I didn't want to spend an hour in the bathroom drying mine!
My wife used to do hair and neither of us had any complaints about the hairdryer at the resort. :sunny:
I agree with niagrabbw. They are kind of iffy. One visit I just could not get my hair dry as the hairdryer was lukewarm. Even after reporting it twice they said it was fine. Next visit I found the dryer to be better. If you really want to be sure bring your own.