Having a hot temper is definitely a bad trait for a planner; you have to pick your battles and not take defeats personally. You can be ripped to shreds in public by your Board (when that's politically advantageous to them) and the next day they're extolling your virtues. And you need to be detail-oriented, as a seemingly simple project may end up in court one day, and you'll have to justify your reasoning. I think Brent hit the high points: you're doing a public service for your community (as opposed to being a shill for some half-baked development), and it can be fascinating work. And yes, go for that internship. You may find you're more suited for another field, but remember, there are many different types of planning (local, state, regional; long-range, short-range, historic preservation, trails, etc.)and you may find that one piques your interest more than another.