I wish I worked in a bar, that sounds perfect! I'm a programmer and I work in a lovely flourescent lit office, staring at a pc screen all day. Interaction in our office is mostly over IM, and limited to questions about things I've answered a million times before. Around mid-afternoon my dp starts to kick in real bad, and clears up once i leave.
i know this is the opposite of what you asked, but i say avoid jobs where you have to sit in the same chair all day, interact very little with people, and where the potential for boredom can lead to self monitoring. and at the sake of sounding cliche, do something stimulating that you enjoy, if you're lucky enough to find it.
-ru