Walking (hence the username), reading, languages (human or code), hacking roguelikes and muds, knitting. Doesn't sound like much when I just list them, but I can happily spend a roughly infinite amount of time on them.
You should travel. Very few people regret traveling.
Start somewhere easy like Thailand, spend six weeks crossing India, spend a month or two in Vietnam. Travel light, but take a credit card. You'll be transformed and work will make sense again.
