things to packed for winter themed tour (dec 26-30'08)

can any1 help me pls... i%26#39;l be travelling to Korea on dec 26-30%26#39;08. and i dont hav any idea on wat 2 bring. wat are the important or necessarily things i shud bring on this tour help me wid the clothes i shud be wearing. these are the places i%26#39;l be visiting

1. nami island

2. Vivaldi ski resort

3. strawberry farm

4. everland

5. dongdaemoon market

7. lotte world