I spend too much time on computer, but I wouldn't call that a hobby. I also don't actually play rpgs, computer games or board/card games, mostly because no-one I know knows the games I'd like to play.
I'm not doing it enough, but I'm trying to learn drawing, 3D-modeling and related things, both for school and enjoyment. I'd like to tell stories through some visual medium some day.
I'm interested in learing tai chi, a martial art that doesn't look violent until you see how that slow-motion form or
pushing hands is applied. Unfortunately, good teachers are rare in Finland.
I read lots of fantasy literature. Terry Pratchett is great for comedy, but Gene Wolfe's Wizard Knight duology is the best serious fantasy I've ever read. It had places like Midgård and Niflheim, and giants called Angrborn after their mother Angr, who married one of the gods of Valfather's court - how awesome is that? But more importantly, it was like an epic (Beowulf or something), but from the perspective of the heroes who suffer through it. At one point, I almost stopped reading because I was afraid of what would happen to some of the characters...