I've not done the tour, but, I've heard that anyone can sign up for the tour. It's a great way to get to see the resort & decide if you'd like to stay there next time.
You can always inquire at your hotel's Guest Services/Concierge (if you're On Site), or call over to the Wilderness Lodge at 407-824-3200 to ask them, if you want to make sure.
Enjoy the Magic!