travel!!! seriously, it's not even close!
I'm only (?) 25 myself. You're young, you have no real reponsibilities (wife, kids, house etc) and the time/money to travel. go for it! you most likely won't be able to do it later in your life. the car can wait imo. at some point if you don't do it you will be sitting in a traffic jam on a miserable monday morning going to work and you will be thinking "i missed a great opportunity."
and yeah, I love traveling by myself too. Don't have to talk to anybody on the train, just look out of the window and listen to music. If you wanna talk to somebody you'll meet new people at the local pub. Call me crazy, back when I lived in FL I sometimes even went to Busch Gardens by myself ;p I could ride whatever Rollercoaster I want and as much as I want lol.
*edit*
and btw, you wouldn't have to go to epcot anymore to do the "drinking around the world" thing
