A great way of seeing the city is by taking this tour bus. It will show you the city from the streets, and because you will mostly be taking the subway, this is great way to see the city from street view. The buses are single- and double-decker buses and for around 10$ they give you a great tour. Most buses offer hop on and hop off services making it easy for you to get on. The buses run from Tuesday until Sunday from 9 a.m. to 7 p.m. There is also a night run from 8 p.m. to 10 p.m.
Seoul City Tour Bus