I'm currently reading Neal Gabler's biography of Walt Disney and have been impressed thus far. It's (for me) heavy reading and the author speculates about the reasons for some of Walt's behavior, but it's thoroughly researched and includes anecdotes I had not heard before. Very thorough and worth delving into if you've already read some about the history of Walt and the Disney company. If you haven't read much, then I'd start with Bob Thomas' biographies of both Walt and Roy Disney. Neither does more than touch on some of the more controversial aspects of Walt's life, but both had access to the Disney archives and family, at a time when more of the family was still around. Those books share all the basic facts of the lives on the Disney brothers.
Jim Korkis' Vault of Walt books are not comprehensive biographies, but share tales from behind the scenes of Disney parks and movies. They could be great vacation reads, while you're immersed in Disneydom. Along those lines, reading stories from Disney park cast members, like Kevin Yee's "Mouse Trap", David's Koenig's "Mouse Tales" and "Realityland" give you and idea of what it is like to work in the parks and could be fun to read while you're interacting with so many cast members. You may also be interested in things like Steve Barret's Hidden Mickey's books, Kevin Yee's "Walt Disney World Hidden History" or Lou Mongello's Disney World trivia books.
Several books by former corporate Disney employees shed light behind the scenes on what went into making the park. Relatively well-known books include Marty Sklar's (writer for Walt, later head of Imagineering) "Dream It! Do It", Jack Lindquist's (first President of Disneyland) "In Service to The Mouse", Charlie Ridway's (WDW PR) "Spinning Disney's World", and Ron Schneider's (actor and creator of Dreamfinder character) "From Dreamer to Dreamfinder". I'd recommend all of those books. Steve Alcorn's and David Green's "Building a Better Mouse" takes a little while to get going, but once it does provides a compelling look at the creation of the American Adventure pavilion in EPCOT Center, from the point of view of the electrical engineers who worked to bring that show to life.
That ought to keep you busy for awhile.