Just because I think it is interesting to see what other people do.
Me: I like to play around with computers (and I’m on this message board, imagine!) trying different OS’es, a little bit of programming, etc., and I also noodle around on the guitar sometimes. I’m trying to think of other stuff to get into, though.
I sew (cross stitch and hardanger), read fiction (mysteries, mostly), play poker online (in the SDMB weekly tourney and other sites), and torment my teen (it’s a hobby, right?)
I’m into
…and I guess that’s about it. Kind of boring, really.
I’m obsessed with golf, and I’m a black belt in hapkido. I also like to do various home improvement projects, hiking, and enjoy dining at fine restaurants. Unfortunately, my hobby of flying airplanes has lapsed because DC airspace sucks big time.
Turn ons include short to medium-length walks on the beach (I get bored on long ones). Turn offs include mean people.
I knit, make patchwork quilts, read (more and more nonfiction as I get older), cook, design elaborate household managements systems that never work, take long nature walks, and garden. I used to enjoy designing houses with my home design software, before I got a really good house of my own.
My husband has a cool hobby–he designs circuit boards for home hobbyists to build tube amplifiers with. He also gardens, cooks, and runs.
My hobby time has been limited for the last couple of years, but, had I the time, I could pick back up on:
Ham Radio
Rocketry
R/C Aircraft
Geocaching
Programming
Home Improvement
Running, cross-stitching, sewing (occasionally), crossword puzzles, and board games. (Mostly Euro, like Crowbar of Irony.)
And fiddling with my iPhone.
I collect model horses, and re-sculpt & repaint them. I have almost 500 in my collection. Same with dog statues, but far fewer, maybe 100-150.
I write. Hoping that someday this will be more than a ‘hobby’, but right now, I am unpublished and just do it for me & a few friends that enjoy reading it.
I read.
I occasionally draw & paint, not as much as I used to, tho.
Photography, mainly. A little hard to describe in a way that doesn’t end up sounding obsessive-compulsive, but one of my main subjects in recent years has been all sorts of transportation devices. Aircraft, trucks, trains, shipping. I’t’s a bit like collecting stamps, in that each item is different and there’s a good feeling when I’ve captured something rare, but I also enjoy just the traveling around to new places as I search for new subjects.
I’ve been doing this for a quite a long time, but recently I’ve found it can get a bit dicy at times. People sometimes seem to think I’m a would-be terrorist. Can’t imagine why. :dubious:
I’ve also got a crapload of model railway equipment in a closet, if I ever can get around to setting up a layout of some kind.
I sew. I’ve done historical re-reaction, sewn a bunch of my own clothes, and made my wedding dress and a few wedding dresses for close friends. I’ve just started making fleece stuffed animal monster things, and am enjoying it.
I’ve done spinning and weaving, chainmail, and all kinds of beadwork, and I sometimes think about getting back into it but currently I have two small children and things that are very fiddly try my patience.
I also read a lot and cook and bake compulsively. I do most of our bread and most things from scratch.
Video gaming, poker, fantasy football, and the SDMB. I’m a full time worker and a full time grad student, so I don’t really have time for much else. 
Reading, writing, genealogy, cross-stitch, and I’m going to learn to knit.
Pole Dancing
I also grow hot peppers and make pepper jam, but that is turning into more of a sideline business than a hobby. The pole dancing pretty much takes up all of my spare waking hours.
Stained glass
gardening
baking and canning
reading
classical guitar
calligraphy (tinkered with a little, still play with now and then)
beading (newish)
economics
hiking
Must… not… demand… elaboration.
-Riding and showing horses
-a little gardening
-reading
-used to train and show dogs, and might again in a couple of years when there’ll probably be a new puppy. There just aren’t enough weekends to do horses and dogs, alas.
Chess
Video gaming
Baseball
Aviation
Magic
scuba dive when i can afford it - warm-water diving only - otherwise community theater is my number one hobby and where 99% of my friends are. i’ve done everything there is to do in CT except for direct my own show. i mostly stage manage and have some 65 shows under my belt to date.
Hobbies?
Foraging for various wild edible foods (bull whip kelp pickles are my specialty!)
Running
Letter Writing (I’m starting up a letting writing club here)
Removing invasive species from salmon habitat
Attempting to not eat unhappy animals (The attempt part has become a hobby, because I envitably fail, but I don’t stop trying)
In fact, I’ve been needing some new and exciting people to write to, so if you’d like to write and receive letters, PM me 