I did the Wild by Design tour in Feb and it was fantastic. Long though, the tour started at 9am and ended at 1:30pm. It was really interesting going into the control room of Mission Space, and under the Test Track while doing the backstage events. Only issue was the was no lunch, snack or water given as with other tours: unfortunately I was not prepared for the non-supply of water, since it was my fourth tour in six days and the only one that did not give the participants water (or coffee for those who drink it) at the break time. Plus break was 15minutes behind the coffee shop by the fountain. Good thing it was here as I got into Station Cool to try the free Coca Cola drinks from around the world.
But I digress: the Wild by Design tour is really good and the pin you get is great also.