Thanks Missnikki,
You have helped me a lot on this! LOL. Are you going to use something similiar?
I changed that they renew how you said it and do agree that it's probably fine that I still give all the days even if they sign up in September and take the entire week in December for free. I could use it as a marketing tool then and still abide by my contract that "If you enroll before September 19, 2011 receive one week free during Christmas vacation!"
Besides, I really don't want to do the math of mid-year enrollments and be too techincal, it's only a few free days (if they remember to use them) and I also get the same amount of days paid for vacation anyways. Thanks again, I got it all figured out!