I suppose not many people consider Australia as a Carp fishing destination, there are a lot of other things to do in Australia, but I think Australia has quite a bit to offer and is unique in many ways, its about as far away from anywhere you could go to catch Carp and they are truly wild and un-managed, to land a 20, 30 or if you are really on the game a 40 that has never been caught is just ground breaking.
The fishing isn't that dangerous, there's things you can do to manage risk and stuff like crocodiles are only an issue in the northern states, black widows aren't an issue I got bitten by one hanging out the washing, it wasn't pleasant but not life threatening, night fishing is fine.
Some states have ridiculous rules regarding Carp that they are on the whole incapable of policing, but here in NSW and the ACT its ok to catch and release, if you are thinking of coming over pm me as I have contacts in most states and I'm sure we'll be able to put you on to some Aus Carp.
atb,
Chris