I don't know if it's off peak or not. I had trouble getting a deal on a car and was told because it was Presidents week (our school up north is off all week), it was considered a high time. I did eventually get a car at an OK price from MCO to Cape Canaveral.
I called to see if I could reserve a 4th floor port side room and was told that I would be assigned a regular priceline room, which was two bedrooms (one with a queen bed, one with bunks), two TV's, pull out sofa, micro, etc. with a river view. She said if they needed a larger room, I would most likely be moved, but that that seldom happens. At check in, she said I could ask for a 4th floor portside, but for now, they were full.