I'll be at WDW for 7 days with my sister's family and our parents. I'm doing most of the planning and really want my folks to have a great time. While my dad will go along with whatever the group wants to do, I don't want him to miss any opportunities that he would truly like. He was an engineer and builder, so I think one of the tours that focus on the design of Disney World would really trip his ticket. I'm looking at the Keys to the Kingdom vs. Marceline to Magic Kingdom. From the descriptions, it seems clear that the Keys tour definitely includes a lot of information about the design and construction elements...does Marceline as well? Or is the vast majority about Walt's life? I'd prefer the shorter tour, but not if it isn't as interesting from a design perspective.
Any insights in to this? Or anything else you have to recommend for the early-70s grandparents to do that is just for them to take a break from shadowing the kids all day?