I am sure I've seen chatter about this before, but I figure a lot of board 8ers like to learn about new things and nothing beats free. I am talking about schools like Stanford, Princeton, and Penn. This would be a really amazing chance to spend your summer learning about stuff that you couldn't otherwise either afford or have time to do. There is a big focus on math and computer science, but they offer a lot of other courses as well.
Personally I am looking at A History of the world since 1300 and the Game Theory courses as something I would be interested in, although a lot of them jump off the page at me. In fact if you play mafia I would highly suggest taking the Game Theory course if you have time, maybe you could be almost as good as me.
Here are a couple links:
http://www.udacity.com/courses
https://www.coursera.org/courses
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The Cult of Personality.