Seoul has a pretty fantastic public transit system. Busses and subways come every 5 to 15 minutes, are clean and fast (you better hold on tight!), and are still

Seoul has a pretty fantastic public transit system. Busses and subways come every 5 to 15 minutes, are clean and fast (you better hold on tight!), and are still expanding year after year to the few underserved areas in Seoul and to the cities surrounded Seoul. There are digital signs giving you the time and location of the coming vehicle, and TVs showing news and entertainment segments. Strong cellular service so you're never without a connection. The busses and subways do stop running around midnight to 1AM, but there is always the choice of taking a taxi, which are also plentiful, fast, and cheap (a ride from the south part of Seoul to the north part is only about $10).