The job is for an inflatable play ground for children. I do love children and I really need the work. Can you help me to incorporate that into an answer as to why I want to work there? Anything helps. I always get anxiety before an interview and all my great answers go out the door, so I plan to go prepared with a flashcard. (but it wont be obvious)

Well, you said the reason yourself. You love children.

Have you had any other experience working with children? If you have, you could use it to back up why you want to work there. 'I want to work here because I really love to work with children, and I've worked in a playschool before OR I've taught children at a school before'

Something to that effect, to prove you aren't just someone who likes kids and needs the work. Hope I helped, and good luck!