We loved Orana Park - it might not be as fancy as some big city zoos, but the animals all seem well cared for and content. There are plenty of opportunity to hand feed some of the animals (giraffes, rhinos, farmyard animals etc) or to watch others such as tigers, lions, otters being fed - check their website for times before you go. Lots of keepers and volunteers around to ask questions of, and a great little free shuttle goes around the park every half hour.
Only downside is probably the food (expensive and very ordinary) but there are many areas around to sit and eat your own food, including by the playground with a huge flying fox.
It's a big place, so set aside aside a good few hours.
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