Hi Vrl, I'd do a direct drive from Geelong to Eden on theirs south Coast of NSW, heavy traffic time of year with school holidays over Christmas if that is when you are going, every camping ground will be prebooked and absolutely full, possibly more so since Bali may be volcanoed out.
But try In coastal order heading north.
Merimbula, Tathra and Dalmeny, Moruya beach, look around Ulladulla and Mollymook.
Geroa and Werri Beach just before Kiama. Sydney beaches well really only Manly, too competitive, head north, look at Umina, Terrigal then Shelly Beach, there are many others.
Head past Newcastle and Crescent Head where you can join the frothing throng, Evans Head Scotts head, with a lot of rain the areas will be sharky, Ballina very sharky, don't surf alone ( this is genuine serious advice).
Byron Bay , happy hippyland and multiple longboard contenders but if you get. a good wave to yourself you will know why.
Good place to watch and learn style and glide.

I've taken up troll hunting just for fun, instead of a rifle I'll just use a pun! 冲浪爷爷