There's lots of ways to get more referrals. But here's the easiest one I know. Set two different prices for your camp tuition. When someone contacts you to ask how much it costs (that's their favorite question, right?), you simply reply, "Well, do you want the regular price, or the referral price?" This will pique their interest like crazy, at which point you tell them the price of camp goes down a few bucks for each referral they give you. Your word-of-mouth enrollment will increase like gangbusters, trust me on this one.