If you don't do a sport, or do not have a varsity, then make sure you kill the CFA. Remember it is the whole candidate score that will earn you an appointment (along with a nomination, of course). Academics I believe is only 60%, half GPA half SAT/ACT. Leadership is 30% (this category includes sports and other EC), and Physical Fitness is 10% (CFA).
I'm candidate for co2016 as well. Best of luck to all of us