Uggh. I own about 35 Disney sites, many with the name "Disney" included in the domain. I know Disney legal very well, and I know what they are fine with, and what they are not. They would not be fine with this at all.
DO NOT develop this name. Disney is particularly aggressive on any site that has to do with park passes. This is a very touchy subject with them. They have been known to come after you very aggressively, and from my knowledge on this, have never lost a case, and usually sue for very large amounts.
You have already stated you are a newbie, consider this a lesson learned, and move on to something else. There is a reason why this domain was still available on July 23, 2008 for you to register. It isn't worth anything to you or anyone else.
If you plan on developing a site, I would strongly suggest you get your "lawyers" to sign a letter that guarantees that they will cover any costs you incur when you are sued in a few months. They will just laugh at you, the same way I am laughing at you right now for even thinking about developing this domain.