We spent very little when we went this past May. We did not take our 1 year old, so we allotted money for one nice gift for her, but decided we didn't need anything for ourselves because the trip and nice dining was a treat enough! We were in Orlando 5 days (did water park, too), and spent about $300 extra (outside of our normal meals). I would say that $300 included drinks, snacks, gifts, and park pictures. I know you are going with a larger family, so that may not help you much, but we knew when we went, about what type gifts we wanted to buy and about how much we wanted to spend. We could have spent more than that, but decided it was just "stuff" and we valued the trip itself!!!!!!