For fresh air and good exercise, head out for a hike on the Seoul Fortress Wall. The wall circles much of the old city and offers some beautiful views of Seoul. The Mt. Bugaksan section of the Seoul Fortress can be accessed via Anguk Station on Seoul Metro Line 3 (exit #2). Immediately outside the exit is a bus stop. Take bus #02 to the Sungkyunkwan University rear gate. Don't forget your passport or Alien Registration Card, as you will need it to start your trek.
Pojangmachas, or street food tents, offer up a truly unique Korean dining experience. Here, you can pull up a plastic chair and watch the streets of Seoul pass by you by as you fill up on good, cheap food like tteokbokki and odeng.