You should most definitely take as many AP classes as possible. Many colleges and universities give credits for scores of 4 or 5 on the AP exam. My son took every AP class possible and scored a 5 on all of the exams. Because of those great scores, he actually started college this year as 2nd semester sophomore. He had the option of graduating early. He is using the opportunity to take more classes!! Good luck to you!!
I think you should because it will help boost your transcript and it will show colleges (When you apply) that you took on harder classes early on. Or you could wait to junior or senior year to take it, but those should be your relaxing years.