Who has time for hobbies outside of OOTP? Heck, if I'm not working, eating, or sleeping, I'm probably playing OOTP.
Okay, but seriously, I'm not sure they quite count as hobbies, but I love music (but am unmusical, so strictly as listener, not a musician), literature of all stripes (my favorite crime fiction writer is Henning Mankell), art (some favorites: Rothko, Modigliani, El Greco), fashion (well, the art of clothing and sartorial style, anyway.)
Basically I'm a humanities/aesthetics geek and people are often surprised when they find out how passionate about baseball I am. I don't fit too many sporty stereotypes.
I guess I'm more the Roger Angell type baseball fan.
Oh, and I'm a Coloradan, so I guess you could say hiking is also a hobby of mine. (Unfortunately, having been diagnosed with lung-involved sarcoidosis in the past year and half the hiking has been curtailed a bit.)