Knitting and crocheting and everything fiber-arts related. I love it because it seems tedious or stupid to a lot of people who don't know how to knit, but I get

Knitting and crocheting and everything fiber-arts related. I love it because it seems tedious or stupid to a lot of people who don't know how to knit, but I get a lot of satisfaction out of creating fun things for my friends and family and myself (see http://a3.twimg.com/profile_images/432735303/Photo_on_2009-09-23_at_19.15__2.jpg http://a3.twimg.com/profile_images/432735303/Photo_on_2009-0... for one ;) ) and I also enjoy using my tech background to convince people on Ravelry (a super big social networking site for knitters etc.) that knitting and designing patterns can be a lot like coding (cause some of them are super intimidated by tech, bah). I also loooooove playing the piano. And making ice cream from scratch, for the interesting combinations and flavors you can make. And like a lot of other HNers are mentioning, learning foreign languages, even though I don't necessarily get a chance to practice speaking them much :( Snowboarding too, despite living in sunny LA. I wish I could get started with indoor rock climbing here as well, but I haven't really found anywhere good for that near where I live.