I'm from Australia myself, and I thought that - just to make your trip that little bit nicer - to point out that in addition to having around 9 of the world's 10 worst snakes (and trust me - most of ours would urinate on a rattlesnake before considering it threatening - the Taipan is deadlier, faster and SUPER-aggressive), crocodiles that make a steady diet out of tourists too stupid to obey the 'don't swim in this river' signs, kangaroos in plague numbers that will seriously gouge your face out, and even koalas that are badass enough to get aggressive if they aren't too stone on the THC in gumleaves to stay neutral (yes, I might be talking my country up a little here).....we also have THIS fella: http://en.wikipedia.org/wiki/Sydney_funnel-web
It's basically a toss-up between this guy and the brazillian banana-spider for 'world's deadliest spider' (the brazillian spider has more deaths in recent decades, but that's because we keep anti-venom for the funnel-web freaken everywhere). They've got an ultra-strong biting action that can pierce clothing and thin shoes, they've been known to kill a person within 15 minutes (15 FREAKIN MINUTES!!!), and what's more....they are mega-aggressive. As in they'll chase you across a room. I'm not kidding.
Add to that that the males are roaming creatures who regularly inhabit human clothes-drawers, shoes, cupboards and so forth.
On top of which, their poison is only ultra-deadly to one species (it's normal-spider-deadly to the usual prey, but only super-omg-that's-a-biowarfare-poison-deadly to one). Primates. And guess how many species of primate there are in Australia. That's right, one. Humans. The little bastards evolved to kill humans.
Anyway, have a good trip. Don't think about the funnel-webs while you're in Sydney/NSW. Really, just put them out your mind
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(oh, and in case the poms win the next Ashes, just thought I'd point out from the Wikipedia page that not only have we sent you guys a confirmed colony of redback spiders, but Sydney funnelwebs have apparently been sighted in Gloustershire!) Take that, reverse colonisation!!!)
Edit: on the flip-side, we also get genuine cat-plagues (as in descendants of former house-cats - they're too cautious to get killed by the predators here, and even our city suburbs are pretty cat-friendly, so folks generally let them roam outdoors), which despite annoying our farmers, I find freaken AWESOME!!!.