It’s been a while since I hiked up a mountain. I still do some hiking – but mostly of the “urban” variety, e.g. my 20 km walk across the Seoul ten days ago. When you walk up a mountain in Korea, it’s not really that solitary an experience, even if you do it alone. There are a lot of people in Korea who hike up mountains. There are shops selling things at the bases of trails.
One thing you can buy are these little printed hankerchiefs (손수건) that have maps on them. The maps show the specific mountain or park or location where you are hiking – they can function as a sort of souvenir, too. I have quite a few of these – maybe a dozen or so. I put them on my walls in my apartment, as a sort of dorm-room-esque decor.