Needing to go to relieve some discomfort ladies???
My experience in Korea took me to comfort rooms or toilet facilities that are really clean....However, the stalls have doors (sliding) on some and no locks. I was really surprised by an old lady charging in, hehehe
btw, squatting is the way to go because normally, there's only one stall where you can sit.......so watch out and have a go :)
Halla is a great mountain to hike: you can take the bus halfway up and the rest is stairs. You can go up one way and down the other (don't worry; buses, taxis and friendly locals are all available to get you back to your hotel/car).
The problem? Often the last 200 meters (the really difficult part) is closed off so the vegetation can regenerate.
The other problem? The Lonely Planet isn't kidding when they say go early; by late morning a heavy haze blankets the surroundings and the view diminishes.