I arrive 11/19th leave 11/28th. So my full window opens on 10/29th i was told. The lady said they were starting w 10am time slots for am & 3pm afternoon slots. From what she said i cant see any harm in pre booking because you can still use it in park the way you would be without prebooking. Also has no impact on Genie + purchase if you choose that as well.When is your arrival, I'm curious on the actual implementation of the 2 pre booked + in park. We have a lot of other variables in our touring party beyond my autistic brother so pre-planning may not be in our best interest.