Help Me Plan My Trip To Seoul, South Korea

As I mentioned in this post, I have a one-way JFK to Hong Kong first class ticket on Cathay Pacific that I booked with 75,000 pre-Avios British Airways miles; and now that I'm adept at booking Korean Air awards using Ultimate Rewards, I figured I'd have TPG editor Eric meet me in Seoul for some Gangnam-style fun the first week in November.
I've never been to South Korea before, but I hear it's a fascinating place with plenty to see and do, great food (I'm looking forward to some spicy bibimbap) and interesting fashions (if PSY is to be taken as an example).

I'm going to be there for three days, and apart from checking out a few hotels and taking a tour to the Demilitarized Zone on the border with North Korea, I haven't made any plans yet.
That's where you come in. My readers always have fantastic suggestions no matter which far-flung corner of the world I'm headed to next, and I bet a ton of you have some great ideas for how I should spend my time and what I should see while I'm in Seoul.
Please leave your comments below with your top picks of what to do while in Seoul, or Tweet me or leave a comment on Facebook, and if any TPG readers are around, I'd love to meet you while I'm there, so let me know!
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