I have two answers. My Dream Job and the one I actually have.
As a CPA with a lot of management audit experience my dream job would be "Freelance Internal Auditor, Devils' Advocate, and Announcer That The Emperor Is Not Wearing Clothes" and reporting directly to the President of WDW. I would get specific assignments which would include costume as "Tourist" or "Suit" or job-specific. It would entail talking to Guest and other Cast and making suggestions for improvements to both the Guest and Cast experience.
My actual job is Guest Relations, Ticket Sales, and Park Greeter at Typhoon Lagoon, but I work no more than two days a week (Wednesdays and Thursdays) and have fun. (I do not need the job; I spend more money in an average monthy that I make there, but I can have fun with Guests and the discounts and free admission help.)