Well, looking at the stats, the following seem to be well thought of "extracurriculars" by the academy: Boys/girls State, CAP (civil air patrol), public speaking, sports (obviously and with leadership position being key), some volunteer type activities. But I've only seen stats on Boys State, the others are guesses based on seeing who has gotten in and what extras they posted on various forums. But, you should really not worry about which ones, as long as you're into what you're doing, as has been noted.