Bugs and MZ are right. Now remember, this is the "grown up woman's " point of view, not the 20-somethings take.
If your girl is a student and has never worked, she isn't going to get it that you can't just take the week off to fly around the country. If she's a lot better off than you, she won't get it that you can't just jump on planes and buy diamond earrings. And remember if you go, there's a built-in "meet the parents" thing going on.
I would take it real slowly with this girl, she doesn't sound like she comes from your world. And just for laughs, listen (all the way through) to Tim McGraw's "It's a Business Doing Pleasure with You"
http://www.youtube.com/watch?v=g2r0Xmkw7Co
BUT your question was "what's a nice thing I can do when she comes home". My answer would be a nice dinner at her favorite place, and when the (inexpensive) glasses of champagne are served, give her a one-man heartfelt standing ovation, right there in the restaurant, in front of god and everybody. She'll be a little embarrassed, but she'll remember it her whole life.