it is suggested to book a tour 90 days in advance. i booked the KTTKT in may for our september trip. even though it wasn't 90 days, they still took the reservation.
I tried booking the Segway Tour 3 weeks ago and the CM told me I had to wait for the 90 days! Now, there is nothing available over Christmas. I guess I will have to be the persistent one and call every day to see if there is a cancelation. Bummer!