While in Seoul one of the most recommended things to do is going to Jeju island. It is an hour's flight from Seoul and it was totally worth every minute. there are so many beaches and activities to do. While I was there I went snorkeling at Hamdeok beach. The water was so warm and clear! There are so many shops to buy souvenirs and clothes if you want to shop. Jeju is also known for seafood so I would definitely suggest finding a place that has seafood. I had really great food at High Tide! So if you like white sand beaches and amazing seafood you should add Jeju to your list of places to visit while you are in South Korea.