Hi Cindy,
Hooray for your very first trip!! Here are some tips on packing for the park:
I carry a plastic envelope with my plane tickets, park tickets, hotel reservations and anything else for my trip. This makes it easy to locate items when I need them and they are protected from sippy cups and spills in the bag.
I use a lightweight backpack with two compartments. This makes it easier to pack diapers, extra snacks and camera in the main compartment and put snacks, tissues and wipes in the front. Anymore than two compartments has you waiting longer at security and digging into which compartment to find an item. A backpack also keeps your hands free to hold a little one, stroller or food.
In addition, I bring from home cereal for breakfast, snacks and zipper top bags to hold leftover meals and wet clothes. I then can fill this space up with souvenirs on the way home.
If you look at the videos on the site, the moms have packing tips. Heather R. shares her tips here.
Wishing you a magical vacation!
Beth