My kids love Adelaide Zoo. The petting zoo with farm animals is great, cos they get to feed the animals. There's a little Australiana section you can wander thru, where animals run past. The new lion enclosure is excellent. Watching the sea lions or hippos getting fed is fun. The cafe is a little pricey, so pack a lunch, and just find a picnic spot - plenty to choose from.

Adelaide Zoo is a great Zoo it has fantastic gardens a great place to have a picnic.
The entry price is a bit expensive for the size of the zoo and they could do with a few more animals. And like a lot of zoo's if the temperature is above 35 degrees celsius they keep the animals in their night enclosures.