Packing for Korea

Packing for my trip to Korea is going to be a challenge. I usually travel very light, but "doing favors" is going to change that. One of the Korean teachers left me about 50 pounds of old books for me to transport to Korea for her. They wouldn't fit in her suitcases. How could I say "no"? Then I have to bring gifts for my hosts and the students of the schools I will visit. I will have a little room for clothing. I have to be creative in that department. What can I pack so that it doesn't look like I am wearing the same clothes every day even though I really am? I'm usually pretty good at that. Having formal dinners to attend almost every evening complicates things a little. The good thing is I will be returning with almost empty suitcases!