I love videogames. Some may argue that's not a hobby, but I disagree. Try playing 40+ hours on an RPG and say you haven't accomplished anything

Besides that, however...

I love to cook. I have several cookbooks that I try different recipes from, as well as my own concoctions.
I go to the gym every second day (mostly) and I love to play Hockey and Golf.
I have an aquarium and love to learn about aquatics (?) (not the word for it, is it)
I also have a telescope that I do some star gazing from time to time (check out Starry Night Backyard, wicked software for it)

Besides that, I'm a big Movie buff, as well as a TV geek. I have a huge collection of TV series on DVD. We last bought Bones and How I met your mother on DVD (both season 1)

My info