Legendary said:
"Um, that really doesn't make any sense, seeing as how many families (read: adults with kids under 21) stay at CP resorts."
Actually, I think the trailing end of the policy is something like 'unless accompanied by a parent or guardian'. Sorry, but your average twenty-something is not likely to be the 'guardian' of someone around 17-20. I've run into that problem with my cousins before as they are still a little young, but as stated above, treat it like an interview, tell them what they want to hear, and go about your business. But if you cause trouble (which I'm sure you wouldn't ;)) be prepared for the consequences.
jeremy