The Han River is one of my favourite places in Seoul, but I think my students describe it best:
If you are visiting Korea for the first time, I recommend you go to Han river, the most beautiful river in Korea. Han river is located in Seoul, the capital of Korea. Han river has been playing very important role through history. In the past, Han river was used for main transportation. Today, Han river is visited by many people. Citizens enjoy their free time there, such as fishing, water skiing, taking boats, and more!
In addition, Han river was the setting of a Korean move "Monster" (2006). It was a great hit. Anyway, I hope you will have a wonderful time and unforgetable memories at Han river. Just enjoy Korea!