-Make a Disney journal where you record ride statistics, like the length and speed of different rides for reference the next time you go including hidden mickeys and characters and fun facts and trivia.
-Download a Marabic decoder for Indiana Jones and decode all the writing in the line area.
-Get ride soundtracks stuck in your head (and not just like Small world... I was humming Space Mountain the other day...)
-Freak out about who does the voice for different safety spiels (NPH is the California Screamin' guy... have I mentioned that?? Also, Patrick Warburton's voice I think can be heard in four different attractions in both DL and WDW!)
-Write stories based on rides.
-Spend hours researching the mechanics and technology for the effects used on Indiana Jones. Seriously though, that ride is fascinating!
Gee, bet you can't tell what my favorite ride is.... xP
Sorry if we were supposed to have a one thing limit, but all of these just popped into my head...