in Seoul mainly shopping, unless u like museums-visiting coz got alot of palaces, museums to visit.
Dongdaemun & Myeong-Dong are a must-go shopping district. Namdaemun more on wholesales...
That time we went stayed at Hotel Victoria Seoul, Hana Hotel in Jeju & also Vabien II Suites, all left us a good impression.
I can share my itinary if u want.