and for Tasmania, I joined a 3 day tour from Hobart to Lanceston, also quite good, this is the link:
http://www.tourstas.com.au/tours/the-big-3-from-hobart/
They have all local tours that you can name it. Their price is real bargine. I have heard that its good but I did not believe before I went to Aussie in early July. I found them accidentally at GC when I arrived in early July. After comparing the price there, I found that they do provide real bargain package.
You can ask for information through their website. You can book everything in advance and bank-in in HK to avoid the card charges.