Because the animals and the rides share a single site, this tends to be the day itself rather than a stop on the way somewhere else, and the order you take things in matters more than at a park with only one kind of attraction.
Practical help is concentrated rather than spread around: the medical and assistance point is inside the main entrance, not out among the rides, which is worth knowing before you walk the long way back with a tired child. One limit is worth planning for in advance — assistance dogs may come with you as far as the point where riders board, but not onto the rides themselves.
