I usually bring any prescription meds, and a change of clothes, my camera, a book, a CD player, and my tickets, reservations, etc. paperwork.
For a 5 year old, I would bring markers (they can't melt in the Florida sunshine) and a coloring book, or some paper for drawing, and a couple of other favorite toys depending on what your daughter likes to do. I might also pack a small snack like Teddy Grahams or something.