I also bought a Family Season Pass. (PKD). Just make sure when you go to get it processed, you get to the park early. You can avoid a long line if you do. Also, I got the season parking pass for $25 extra. That is well worth it.
Be sure to look over your season pass perks. You should also get a coupon book to use in the park.
We processed our passes first on our initial trip, and when we take the kids, we will get theirs processed then. I have put their vouchers in a safe place until then!