I think Ironpalms has been closed for years. . . as the old owner now manages a gym in Osan and hasn't lived in Mokpo in years. Ironpalms wall on Yudalsan is pretty cool, though. You should also head out to the Meet and Greet this weekend. I think you can get a direct bus from Mokpo to Gochang. . . or time it to go through Gwangju and get a bus from Gwangju to the park.
"If you can't do something well, you might as well learn to enjoy doing it poorly."
-- from a de-motivational poster, but I find it oddly liberating