Just here for archival purposes..
Useful things to pack:
ID. ID. ID. ID.
Money ($20 or so should do)
Bring two bags (I recommend one small carry around, one medium. Large luggage is hard to move around)
1-2 shirts (you'll get a ton more there)
1-2 pairs of socks and underwear
Computer/Laptop + Phone
Pants are bulky but if you want you can bring 1 pair. Probably will not use
Lots of energy :D
Deodorant if you get smelly/sweaty easily