We went to gold coast just before Aus lockdown, we got back into Adelaide SA like 10 days before borders closed lol
DD is 10, loved the parks. The rides were awesome, heaps to see and do but lines are crap, id buy a fast pass in peak times, cuts time off lines, which you would be possibly be in as it school holidays and us southern states look to escape the cold lol
Look on their sites, you find many multi park deals
Sea world is amazing, we stayed at the resort for easy park access, Many behind the scenes things for kids, get real close to the animals, dd did the 2 dolphin meets, one was a swim i joined her on, was a ranger for a day, there they do everything, learn heaps and mum and dad get a little break lol
There other animal sanctuary's and you can do behind scenes stuff in them too, we cuddled a koala and did a tour with a keeper, got into the enclosures
All the animal stuff, the animals welfare comes first, interaction is based on them and groups small to avoid scaring them.
Chopper flights are fun bit pricey but very cool
infinitygc.com.au/ this place is an indoor maze type thing, its all lights, illusions. Look at the site, much better than i could ever explain. DD loved it. So did me and Dp
Google when you on ground here, there may be many free family activities