Yes, we are renting thanks to all the great advice we got on this thread. There is a Hertz location on Disney. I called them directly first to see if there was a better offer and to get transportation info. We told me that a van will pick us up at our hotel (Contemporary). He also said he could not beat the AAA internet rate.
He also offered info on their pricing when I told him how long I needed the car. Based upon my info to him he said returning the car an hour prior to my original schedule would save us a days rental. (I was thinking 9 am on Monday through 10 pm on Tuesday.) It is based on the 24 hour clock.
I may still check into other rental agencies that are on Disney property to see if there is a better deal.
Suzanne