If museums are on your list of things to see, you might want to browse the collections at Seoul Yangnyeongsi Herb Medicine Museum in Dongdaemun-gu. Why not take a stroll along the riverfront and watch the sunset while you're here? It's also full of great shops and restaurants, so you can spend the afternoon having a wander. If you want to see more of the museums in Seoul, you can easily walk to Cheonggyecheon Museum.