I would have to say that of the 4 theme parks, only 3 of them are worth the entry fee: Magic Kingdom, EPCOT, and Disney Studios. Animal Kingdom, in my opinion, has a long ways to go before it'll be worth that $50 ticket. It remains little more (but yes, still more) than a glorified zoo. With the recent announcement by Eisner of a new major attraction, I may change my opinion of it in the future. But for now, I think the first three parks are well worth the price of admission.