I live in Wisconsin and got my first pincode in April (came to my regular email under my maiden name). Then my DH got a code later in April. The first one was for kids 3-9 stay, play and dine free for dates May through August. The second one was for either the kids stay, play and dine free or a package discount for dates October through November.
The only thing I can think of that I did was booked a trip and made a deposit back in January and then cancelled it about 2 weeks later because I thought I was losing my job. Other than that I've never gotten a code before.