I personally find that the getting good grades, going all out with honor society, and other similar stuff is overrated. Now, that doesn't mean that it's useless or you should ignore it, but realize that there are many more things to consider. Just because you get good grades doesn't mean you have the work ethics or the morals to accomplish responsibilities in the real world. I've heard of valedictorians from my high school that ended up dropping out of college. All of the honor society students from my high school that attend the college I go to aren't in any better position than I am, and in many cases are doing worse since they're getting involved with nasty stuff such as drugs. I personally haven't done extracurricular activities, but I did manage to get good grades and snagged some college credit in high school. And here I am at a reasonably good, fairly competitive college with good grades, on track to becoming an engineer.
I guess another way to think of it, its a massive bragging contest that doesn't go anywhere. Understand your goals, understand how to accomplish them, then focus on doing so. Good grades should be a symptom of your success, not the reason for your success.
And Wyte is right, the AP stuff is a huge scam. I've known many people who took those courses and got very little out of it. They slaved for these overly difficult classes and ended up failing the finals, so they got nothing out of it.
Edit: minor errors.