I'm pretty easygoing and generally won't say no if the idea sounds good. Fly out to Penn state (where I didn't go) to watch them play another school (also where I didn't go)? I'm in. Oktobefest in Munich in 6 weeks? Sure! Your skydiving partner bailed and your jump is in 2 hours? I got you.
I dislike routine and predictability. That's boring to me. If you know what's going to happen, it's like you've already done it.
Oh, and INTJ.