take them (AP classes), or not, but rest assured that your competition is taking them. As well as leading some sort of club or organization, participating in varsity sports, working a part time job, while meeting her volunteer hours for NHS and fighting to remain in the top 10% of her class, etc, etc.
Seriously? You want to have fun your senior year?!? I totally get that, I do, but something tells me you should rethink the service academy route. Wanting to have fun is really what young people your age are wired to want, totally normal. Choosing the easier route is way more normal than the more difficult path that these driven kids that have chosen. Most service academy students had a vision-quest (borrowing Brovol's term) from day one of high school and tirelessly persevered all the way through their Senior year of school, even knowing that the real work lay ahead of them! That sure wasn't what I did as a high schooler!
But you know what is really fun? Getting into your dream school! Like I said, take the classes or don't, but doors are probably closing on you if you take the easy path. And that's ok! You will find the right place for you. Does your high school counselor know you want to attend USNA? Ask them to help you with this, but if they won't, or they are too busy, there is lots of great advice on these forums. You just got to have tough skin with some of our answers. We mean well, promise!