Well that'd be cool if you could get some IT work, but then you'd have to take some 'smart' clothes I presume, which would be annoying lugging them about!! Pack extremely light

Diving trips are pretty expensive out there, we did about 5 total I think (can;t say I was overly impressed either) - it's the trips that tend to cost money - Fraser Island will run you several hundred and so will Whit Sunday Islands - all your travel from one place to another, breakfast, lunch & dinner + accommodation, drinking funds

all adds up pretty quickly.
I'm not being negative, just trying to give you motivation to save, save, save until you leave