How do you grind?

First I mess around in several different areas to try and figure out where I'd get the best exp (if there are several areas to choose from). Then I buy pots and clean out my inventory as much as possible. Then I kill whatever I chose to kill. Eventually I turn my MP3 player on. Quit after an hour or two, and if I have 2x exp, take a break for half an hour and come back to continue.