The Grand Park Station on line 4 (exit 2), offers several things to do and see; enough for an entire day if you want. I walked around aimlessly for quite sometime before I could really take in all that there is to do at Seoul's Grand Park Station. I noticed there were at least twenty tourist busses parked in the huge parking lot, but as I got closer to the entrance, I noted that there weren't very many people out to the zoo on a Thursday. This was good!
I noted the several different things to do at Grand Park Station; there's Seoul Land a huge amusement park filled with enough rides for to fill up an entire day, a charmingly small botanical garden, a rose garden which is pretty popular in early spring. Today, I wasn't permitted to enter. There's also the Seoul Museum of Modern Art and The Seoul Zoo.