Yeah Australia's not that small. As said above, to drive sydney to bli-bli is about 10-13 hours if you're up for it.
If you're in Sydney, you definitely want to hit up Penrith cable (about 45 minutes west of the city). My home from home that place. Its really fun.
http://www.cableswakepark.com/
I'd suggest bringing your own stuff cause with the US Dollar being so low against the AU Dollar you're going to find things rather expensive. You might save some costs by bringing your own setup. If you don't, they have LF gear there you can rent.