Our last day in Jeju, we decided to hike the highest mountain/volcano in Korea. We had to wake up super early in order to both hike the entire mountain and make our plane. We didn't take our time as we were a little concerned about our timing.
The whole thing took us around 7 hours. The hardest part was coming down, at least for me. It killed our knees. Going up wasn't a cinch, but I'm always afraid of falling on my way down, and I generally walk like a grandma. Heres the video. It was a fun, challenging experience, but I'm glad its over.