My DH and I just did the Keys to the Kingdom tour last Thursday. It is a 5 hour walking tour...costs $58.00 per person (no children under a certain age). It was absolutely wonderful!! You really get a lot of information about the Kingdom and you also get to go "Backstage" and in the "Tunnels" under the MK. The cost does inclue a lunch (ours was at 11 a.m.) where there were many options on the menu to choose from (from chicken fingers, tuna sandwiches, ham sandwiches, salads and the like!). You get your own "Keys to the Kingdom" pin at lunch as well. We loved the tour and are planning on trying the ones for the other parks for future trips!
HTH,
Korey