There is interesting rock in Mt. Seoraksan. It is called "Heundeul Bawi(Rocking Rock)". Normally 3 people are needed to shake it and you need to push correct direction to shake. Other wise it doesn't shake. It is shaking bit by bit.
It is very popular place to visit in Mt. Seoraksan. Also you need to visit Gwongeumseong fortress by cable car. This fortress is very easy and popular place to visit in Mt. Seoraksan.
It (Ticket office - Heundeul Bawi) will take 1.5 hours to and from ticket office. Course : light for Koreans = Medium for travelers.