Ant, who has since morphed into a true Korean, carried an umbrella the whole way and dutifully finished his makkolli and shin ramyeon after the hike!! I was so proud!! :)
I forget the names, but first we hiked to some lookout rock, then to one of the summits (Obong peak, maybe?), and then down a path that followed a bunch of waterfalls, and thanks to the monsoons they were awesome!!! Mapmyhike listed it from subway to the point where we stopped as 8.63 miles, but that seems a bit - though not too much - longer than we both thought it had been.