Shopping, shopping, shopping.  This is the one of the best spots to get souvenirs, not junk, but little purses, shoes, socks, umbrellas, and clothing in Seoul.  They also have knock offs of brand name purses.  The level of quality varies, and if you ask them for Grade A, they wll show you better look-alikes at a higher price.  It is right near the South Gate in the heart of Seoul.  Shop around and try to bargain without insulting store owners.  If you offer them an unreasonable price, they will walk away from you.

It's incredibly crowded and there will be lots of pushing.  Try not to take insult.