How should I spend my summer?

<p>I'm currently a sophomore, and want to use my summer effectively. I want to study for SAT I (info on how to score really high after studying just over the summer?), but might take Chem over the summer online, and if I have time, self study Calc B/C (or should I get an early start on another AP?). Next year I will be taking AP Stats (might self study B/C with it), AP US, and AP Language. My school runs on a 4 classes per semester basis, with AP classes all year (except Stats and Gov). Of course, I will also be doing a lot of fun things like a Music Festival for a week (I'm not going to use my summer 100% studying), but what would be a good way to use it? How much time will it take to get good at the SAT? Will I have time for anything else?</p>