Here's a list I found....kinda went over it, so if something sounds weird, it's cuz I missed it.
Documents and Other Important Stuff
Valid ID/passport
Birth Certificate
Backup copies of ID's, etc.
Driver's license/vehicle registration
Auto insurance card
Airline/train tickets
Travel itinerary/booking confirmation
Health insurance
Notify credit card companies, utilities, etc. of change of address.
Address book
Credit cards and checks/traveler's checks
Insurance (travel/luggage/emergency)
Necessary immunizations/medications
List of friends' email addresses/phone numbers
Photos of your family and friends
Swimming/sun items
Swimming trunks/swimsuit
Beach/swimming shoes
Towel/bathrobe
Suntan lotion/sunscreen
Sunglasses
Sports/Hobbies
Books/magazines
Camera
Film
Cassette tapes/CD's/radio/walkman
Batteries
Sports equipment
Shoe cleaner/polish
Toiletries
Soap/shower-gel/shampoo
Face lotion/creme
Toothpaste/toothbrush
Deodorant
Comb, hairbrush
Manicure kit
Shaving kit
Hair dryer
Contact lenses/case/solution
Body lotion
Hairspray, mousse/hair gel
Hair clips, hair net, barrettes
Make-up
Feminine hygiene
Clothing
Underwear
Pants/shorts/belts
Sweaters (it gets chilly in Winter)
T-shirts
Dress clothes/skirt (one outfit for Traditions)
Necktie
Jacket/coat
Socks/nylons/tights
Pyjamas/nightshirt/nightgown
Hats, caps, etc.
Day shoes/walking shoes/running
shoes
Sandals
Dress Shoes
Towel, bed linens, wash rag
Insect repellent
Travel alarm clock
Travel guide
City map
Travel map
Extra set of glasses
Snack food
Sunglasses
Umbrella
CD Discman/Walkman
CDs
Favorite Videos
Computer
Small Stereo
TV/VCR/DVD
Combination/padlock for your locker