Student Exchange Programs

Hi!
So, next spring I will be traveling to Pamplona, Spain for an exchange program for 2 weeks through a high school exchange program. In the fall I will be hosting a student from there as well.

I am in my Spanish II currently, and will have completed most of Spanish III by the time I go there, but as my teacher is Chilean, I was wondering what the differences are between South American Spanish and Spain Spanish (if that makes any sense). For example, any grammatical differences, as well as vocabulary differences.

Anything anyone knows about hosting a Spanish exchange student as well as going to Pamplona would be awesome as well!

Thanks!! (: