Hiya,  I lived in Daegu, Korea for five years, and have been to Seoul many times, and to Jeju three times. 

In Seoul I would go to Insadong, Dongdaemun and Namdaemun markets.  Insadong is not far from the Cheungdaecheung river, which can be nice.  It's also located in an area called Jong-ro which is good for shopping and bookshops.

As for Jeju island, I climbed Halla mountain twice.  It's an easy enough hike, though the mountain can be a bit tricky to get to.  That said, it was the best part of Jeju island for me.

The buses and the trains are both fine, though of course, the high speed KTX is the newest and the fastest. 

Have a great trip, and enjoy the food!
Tara S, Sep 4, 2009 @ 18:55

Hello.

I hope I didn't find this article too late.
I am originally from Seoul. If you send me a message with your email, I will send you some of the suggested attractions I have created within Seoul (I already have a draft since my friends have already asked me for tips, so don't hesitate to send me a msg~! :)

I can give a you a few more suggestions for other cities which you can travel.

Going back to your question, it is far more convenient to travel by train since you are likely to get stuck in traffic jams. :(

Let me know if there is more you would like to know~!
Cheers~!

beloquent, Sep 17, 2009 @ 20:40