To start your trip from Brisbane, none of these are secret spots more of a must checkout list.
Southport spit,Burleigh Heads,Snapper through to Rainbow Bay ,Greenmount,Kirra.
D-bah if its small elsewhere (beware its shortboarding mica ) but you came get some.
That's the Gold Coast stretch covered.
Heading down into NSW's, Cresent Heads is a must, as the other guy's said Angourie, I've got scares to prove how good that place is

Sounds like your going to have a blast, you lucky bugger