In May, me, my husband, and 4 children(2,4,8, &13), are taking a vacation to Orlando. We will be there for 8 days. One of the days we are going to the Magic Kingdom, and another day we will be going to Islands of Adventure at Universal. I want to purchase the photopass so that I can enjoy being in photos with the family too. My question is that since we are only going to one Disney park for one day will it be worth purchasing either photopass or photopass+? If I so decide to purchase one can I purchase it as soon as February or will I have to wait closer to May?