Moved to Forum: Original Link
The Brisbane Airtrain is a pricey public transport way to get to and from the airport. If you can get yourself to DFO at the Airport Village there is a free shuttle bus to/from the airport terminals.
Translink services to/from DFO -
369 - Mitchelton, Stafford City, Kedron Brook, Aviation High, DFO
590 - Garden City, Carindale, Metroplex, Aviation Precinct, DFO
This is great to know, however while buses can sometimes be convenient, there is still the matter of over-crowing Have you tried looking at www.goldcoasthiredcars.com.au? They propose pre-determined fares on the Gold Coast, so it might just be a better alternative.