sydney is probably what youre looking for.
it has the most work available, good pay, good beaches and a reasonable night life. the girls are pretty good aswell. plenty of hostels to stay in while your working but cheap accommodation can be found if you give it a decent go
from there you can go up and down the coast. heaps to do so im not gonna list it just search it.
"I have to be naked to shit my best, at least no shirt on And I can't take a test in school with shoes on I also can't have sex with a condom on, it itches #winning" -ECB$