What advice should you give to a foreigner coming Korea for the first time?

When you visit Korea, first you should learn basic Korean like annyunghaseyo, kamsahapnida.
Because, some Koreans try to evade foreigners who don't speak his language. And when you speak Korean they may help you freely.

 Second, you should go to Gyeongbokgung (Palace), Gyeongbokgung is the oldest of five royal palaces of the Joseon period. And Korea has many houses where you can hire hanbok. So if you wear the hanbok and visit gyeongbokgung, you might feel King of Joseon Dynasty period.

 Third, you make Korean friend and visit his home, Living with him, you eat Korean food and learn about Korea's duty.