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One of the most popular activities in Korea is hiking. Every where in Korea, there are hills and mountains.
Mostly near the big city, the mountains are very crowded with locals. If you reach the top around the lunch time, you can meet bunch of people, etaing their lunch box… its smell is covering the fresh smell of the nature! You can also meet little kids with simple shoes, crawling everywhere with their parents.
Bring water and some fruits with lunch box. You can also buy them at the entrance of mountains. Gimbap is simple and easy to carry. Most of mountains in Seoul are easy to access by subway.