Another 100,000 won withdrawn again. But I found out that my bank doesn't charge me an international ATM fee and they gave me a much better exchange rate than the San Francisco Airport.
But I should still reevaluate my spending decisions. Except right now I'm contemplating going out for lunch. My usual thought is "It's vacation! I can spend however much I want." Which isn't a bad attitude because I may only come to Korea once in my life (I can't totally write it off the list; you never know where you'll end up when you're following God).
So the conclusion is: I don't know how much money is appropriate to spend.