Theme: I’d try to recreate the Legendary Years resort concept, but go further back in scope to the 1870s-1950s, and go with a less “value” approach, making it somewhat more realistic but at the same time including references to the Disney properties set or made in those eras, such as a large Steamboat Willie as a water play area (also including PATF stuff and Oswald), the monkey temple from Jungle Book as an exercise gym, a Victorian Muppets shopping district (Muppet Christmas Carol), a Big Bad Wolf waterslide, a PATF restaurant, etc. Some general pop culture from that era is also thrown in but moreso in an educational context rather than a celebratory one, such as having a dance show covering dance styles and music from 1870-1954, featuring various Disney characters joining in to help dance.
Additionally: A Goofy Movie and Alice in Wonderland get sections at Art of Animation. Pop Century gets a 2000s section with giant statues of Stitch and Angel, Mike and Sulley, Jim Hawkins, and yes, even Sora.