The AAA parking passses come with ticket purchases from AAA. We bought 2 of our hopper tickets from them just to get the pass. The "Diamond Package" which gives you parking and preferred seating for fireworks, etc is what you get when you purchase one of the complete packages from them. They are completely different.
The only blackout date on the pass for the week was NYE, so we were ticked off that the pass was not good at Epcot on the 5th. The marathon is planned well in advance, they should have been able to list this date on the pass.
In any case, the parking as someone else said is right next to the handicapped parking. In most cases, if you get there 30 minutes before park opening, you get the same or better parking. I would imagine if you are a late riser, you would be in the second or third lots and therefore it would be a good deal for you to use the pass.
-f