Seoul?

>>1141585
That doesn't sound like enough time to do much of anything.

Just got back from a 2 week vacation there, it depends what time of day your layover is at.

If it's during the day, go shopping and eat street food in meongdong and then get some korean bbq after more shopping in hongdae. Seoul is an eating/shopping/clubbing city

If it's at night go hit the clubs/bars. Mikes cabin and tuesday party in hongdae are fun to barhop between. If you'd rather go clubbing, you can go to one of the biggest clubs in the world at Club Octagon. I also liked noisy basement 2. It's a hip hop club that's busy every day of the week

The airport in Seoul does not offer international flights, except to Narita. You probably have the layover at Inchon International, which is about a 75 minute bus ride from Seoul. Given that, I would just stay at the airport, it has a lot of nice art on the walls and stuff.

>>1141585
Incheon offers a pretty cool catalog of little tours specifically for people on layovers--believe they're called Airport Tours. Some monuments, local fishing village, maybe a casino? I'm not sure if your layover is long enough to qualify, but I liked the local village tour (it was the only one short enough to work for us). Temple, fish market, lunch, back to airport.

I know from actually visiting Korea a few years later that Seoul is a good hour from the airport in a taxi, so it might be kind of tight to do much solo.

>>1141601
This. Incheon is one of the largest airports in the world, so there's plenty of cool stuff to do there. Including a mother fucking ice rink.