A nice place to take a stroll. It has a good view of Dongtan and Osan. To walk a full circle, it takes about 20 minutes, if you don't stop to take pictures or rest. Might not be good for those who are not strong as there is a lot of uphill walking. There is a free audio tour you can listen to via your phone, but I didn't use this feature. No entrance or parking fee. Also take note that to get to the top, you have to drive up very steep roads. Be careful if you don't have a strong car. Some people opt to walk from the bottom to the entrance. However, as I mentioned, it's very steep and you might get tired before you reach the top. Other than that, you can get good exercise and nice views. The summer is very hot and humid, so be mindful of that as well. When I went, there were some mosquitoes, so it would be good if you use insect repellent.