Just recently took a tour w/Ranger Stan. He said they used to go over to the Villas, outside and to the rooftop, but that has changed. He said that WL does not offer that anymore. Our tour was the main lobby and to the 4th floor. Needless to say, we had about an hour experience w/Stan learning about the breathtaking WL. We had been to WL many times before, but this was our first "official" tour.
If you have the time, do it. Stan is an amazing man.
And no, there is no cost for the tour.