I like to lose myself in the woods, especially when it's really foggy. That's when you can literally become lost, and the experience is quite unworldly!
Playing video games, preferably something easy and casual so that im not engaged to do my best.
Alternately, surf the web endlessly, listen to radio or work on something on the comp.
DCUO, I look forward to it all day long, there are so many other things I should do but don't. I just want to become "someone else" for the rest of the night before I go to bed, and live in a fantasy world where I can be a hero and not me.