Im going to Barcelona over spring vacation and need to now what to bring?

[JennyG]

I am visiting Barcelona over the spring for a class trip, I want to fit in and not look like a total tourist. Can anyone help! I am 16, if that helps?
Can anyone make me an outfit on polyvore? or give me some sites? Im going to buy clothes there.

would skinny jeans be okay? and some AE sandles? let me know? ;D
thanks millions-
Jenn