I'm the kind of person that usually likes to stay in and watch a movie or read than go out all the time, but a night out here and there doesn't hurt.
I walk most places. I think that if you can get somewhere in under an hour on foot, you should walk. But that's just me. My job keeps me in decent shape, but I enjoy playing sports occasionally, especially soccer, baseball, and ultimate frisbee.
I'm really shy at first, but I open up eventually. It just takes a while.