What an interesting question, and as the Gold Coast is a kid friendly city, this is (still) quite a difficult question to answer. You find kids on the Goldie playing at beaches, theme parks, hotels and other worthy areas where play can either be allowed to play, or snuck in gracely. Therefore, on that note, where is the best place (or places) on the Gold Coast for kids to play?
Of course the beaches and the theme parks including Seaworld and Dreamworld to name are a given. Those destinations are at the top of the list for any Gold Coast or interstate parent on the list of things to take their kids to on the Gold Coast.
In the winter months at Pacific Fair, ice skating on penguins that assist with posture is also great, and from what started for the recent school holidays, to now becoming a permanent fixture at Circle on Cavill in Surfers Paradise is an utter surprise.
The answer (at this stage, albeit something different) would have to be the weird and wonderful Bubble Trouble at Circle on Cavill. Your children can easily enjoy themselves inside a closed bubble, with ample oxygen that will keep them floating on top of water, and spinning around in circles for at least two hours. This is something the adults can also do. The kids love it more so, and naturally this attraction is more attractive among the kids. Stand up, walk and fall over, or doggy crawl. It's fun to be in a temporary bubble, like you're floating in space.
Although two hours is the safe limit, the attendants keeping an eye on those who are brave and bold, have mentioned that all in all, the kids in attendance want to be let out of their bubble of fun, and back into natural air within half an hour of entering a bubble. Definitely a water bubble of fun, and is a great stopper to the Circle on Cavill as you are heading towards Ferny Avenue. Can easily be known as the water bubble. Bubble Trouble costs $10 for 10 minutes. Clever and utterly different.
Uh oh...we're in bubble trouble, yet it's all great.