I think it’s something you’ll probably find easily enough. You could always contact the local council and ask

Friday nights they have the Beach markets along surfers beach, Down Cavill mall is also a good location.
Up outside the Crown Plaza there is a mini theme park that has the slingshot, vomitron and dodgem cars etc.
Alison Street in Surfers Paradise is home to the newest permanent exhibition on the Gold Coast and so visible is the work, you can see it from your car.
Down in Broad Beach they also have a mall that has an old fashioned merry go round.
Also on the corner of Victoria Ave and the gold coast highway there is a statue of a horse during the day it looks great but at night it’s lit up with multi coloured lights and looks awesome. Hope this helps

Surfers Paradise is full of all kinds of ‘street art’ around Cavill Avenue and last year they had that Festival where people did a lot of street art – not sure if they’ve left some of it there or not.