I go for a jog or join a mountain climbing to breath fresh air and clear my mind from all worries =')
Besides the obvious spending time with girlfriend and friends, I work-out, play poker and watch (and bet on) sports.
I read, write poetry, read/research online, listen to music, spend time with friends and family. I haven't done much in awhile, but I also like to design/make jewelry and cook/bake.