I had a quite long layover (around 12 hours!) at South Korea before my flight to SFO. I arrived at around five in the morning at Incheon International Airport and decided to join a Transit Tour. These transit tours are for people with long layovers. Tours are free and don't require you to have a Korean VISA.
The transit tours range from an hour to 5 hours. I chose the 2-hour Incheon Temple tour because I have already visited some of the other destinations in the other tours. Also, I still want to explore the airport after the tour and before my boarding time.
The Incheon Temple tour includes visit to Heungryunsa Temple and Memorial Hall for Incheon Landing Operation. I chose the 9-11 morning tour so I can have lunch and airport tour afterwards.
Our tour group at Heungryunsa Temple (Photo from Incheon Transittour Facebook Page)
Memorial Hall for Incheon Landing Operation
More photos are available in this Google Photos album. Joining the Transit Tour has been a great experience. If you have a long stopover in South Korea, I highly recommend you try one of their tours.