I was going to suggest Australia Zoo! I took DS there when he 14 months old and he loved it. There's a lot for them to see and you can involve them in all parts of it, whereas a theme park, there's a lot that you would have to give a miss, KWIM?
We went to Underwater world in December and TBH, i thought it was pretty disappointing. Definitely not worth the 2.5hrs it took us to get there on a 38c day with no air con in the car! We were only in the actual place for about an hour and a half. All DS found interesting was the walk thru aquarium. Thats just my opinion though!
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