It will be roasting hot - sod climbing, get on a jetboat, go whitewater rafting, or something you won't be able to do anywhere else!
That time of year is southern hemisphere summer holidays combined with xmas holidays, so if it's anything like SA sort out accommodation now. There are dozens of backpackers in QT, of variable quality. It's quite a party town, usually overrun with backpackers looking for cheap thrills.
What are you doing over there?