I'd get bored with a thrill ride like M:S or RRC, so maybe something like Splash Mountain so I could hang out on the set areas! Or maybe a place like BTMR, so I could have a mountain range to explore and relax in! My god, this makes me want to go to Disney World! The four months till I go are gonna drag by so slowly...
If I could have any ride, though, I'd pick Indy... fun place to hang out with the lights on, and a former Imagineer told me those vehicles can be programmed for different intensities... I'd turn it up a notch...