学生省钱游：
International Student Identity Card (ISIC)：http://www.isic.org/home.aspx
网站似乎只有英文，但在中国可以办理，进入http://www.isic.org/student-card/buy-an-isic/Asia/China.aspx查看办理地点。
在美国购买这张卡要22美元，不知道中国卖多少钱，但此卡在很多地方可以打折，尤其在出游路费上可以省不少钱。用ISIC在 http://www.studentuniverse.com/购买机票，从芝加哥到拉斯维加斯的机票比网上最便宜的还要便宜60到70美元。往返美国 和中国的机票比其他网站、代理出售的便宜200-300美元。美国国内火车Amtrak和某些租车公司都可以打不少折。

Book flights:

Website: http://www.cheapflights.com/ can compare prices on many websites, but note that it doesn't have travelocity. Check travelocity also, it might have the cheapest price.

Student discount card: both Student Advantage Card and International Student Identity Card (ISIC) can be used to get discount from Amtrak, but as for flight ticket, Student Advantage Card cannot be used on http://www.studentuniverse.com, which has really really cheap tickets for students. Student Advantage Card costs $20, and ISIC costs $22, but if you only want to buy one card, ISIC is recommended.

Book hotel/campingground:

If sometimes the place is fully booked for the period you chose, don’t forget to check the availability for each day. Usually when the website shows “not available”, it assumes that you will stay in the same room or the same site through out the period you chose, but you can always move spot if it’s not a big trouble for you.