i imagine 20-30k would go quick in Europe. Asia or South American would be a far better bet for serious long term stay. You would live very comfortably for a good amount of time with 20k no doubt.
Between being work at slow, and me still living at home and currently reading "Into the Wild" I'm about ready to jump on the next plane somewhere far.
I met an Expat in Laos who was a pro poker player in Europe, saved up a few grand and has been living in South East Asia for the last few years, not doing much of anything but traveling around.