I appreciated your suggestions for the 10-hour layover in a separate thread, but wanted your thoughts on how to structure a 10-hour layover that falls much earlier in the day: one from 4:30am-2:30pm. I appreciate that not much will be open at that time, but are there any good neighborhoods (or scenic hills or river areas) that would make for a pretty and invigorating morning hike? It doesn't even need to be Seoul itself, if Incheon or other easily accessible spots.