Hey bud.
There is plenty to do on the gold coast if your a visitor.
Things I would recommend,
Walk/climb mt warning ( about a 45 min drive from the gold coast over the NSW border ) a long climb but worth it if you catch the sun rise/set.
Springbrook glow worm caves, also the drive out there is fun.
Queensland raceway always has events on if you check there website for whats on. Entry is usually $10 to $25 depending on event.
nerang go karting, a bit pricey but super fun and they let you drift. The whole track is slippery and you can link the whole track with the rite line.
is good for finding things to do.
I was born and raised here and have seen, been or done most things worthy of doing so feel free to ask if something is worth doing.
enjoy your stay.