I love to cook. Something that I find most of us geeks are really bad at. Amazes me how many of my friends can't do simple things with a piece of meat and some veggies, but also how uneducated they are about food in general (The fault of the North American system, probably.)
When it comes to cooking, I do it daily. Love doing Italian and French Cuisine and just sometimes picking at random from one of my cook books. I find the entire process very relaxing and a nice removal after sitting on my ass for 8 hours doing code.
Apart from cooking I love gardening, growing herbs, etc. It goes very nicely with my cooking hobby so it works.
I find the best thing about gardening is how close you get to the rawness that is mother earth. It's another nice way to step back into reality after staring at the computer screen.