Outside of playing guitar/listening to (and acquiring) new music, I enjoy the following:
Reading. I have a voracious appetite for reading. Unfortunately, I'm also an impossibly slow reader, and it takes me weeks to finish a novel. I usually alternate fiction/non fiction to keep it interesting. In the fiction department, I'm a big Stephen King fan (recently converted). In the non-fiction department I'll read anything that looks interesting at the moment.
JRPGs, especially those released by Square, Squaresoft, and Square Enix. I am currently playing Chrono Trigger and FF XI, Midgarsormr server.
Southern Shaolin kung-fu. I study a family system called Fu Jow Pai, closely related to the Hung Gar system.
Old school kung-fu movies, particularily those released by Shaw Brothers during their golden age, 1965-1975.
NYC dive bars. There's nothing like the vibe you get from a classic dive bar. I've been to most of the well-known dive bars in NYC, and am aiming to hit them all eventually!
Tabletop strategy games. My favourites are Axis & Allies and Warhammer 40,000.