My alternative list of countries is: Scotland, Wales, England, Isle of Man, Northern Ireland

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I'd like to travel mostly to see unpolluted, beautiful nature (Thailand, New Zealand, Iceland). But also for food (Thailand, Greece, Spain)
Might like to add Norway to your list; it has loads of relatively untouched wilderness.
When my grandad went to Australia he threw a brick at a snake and it chased him nearly three miles. It was a really poisonous one too. My grandma asked him later why he'd done it, and he said he didn't know. Despite this story, I haven't been put off. Apparently the wildlife is fine as long as you don't throw bricks at it.
A while back I was talking to an American migrant, who spent some time here in his youth before moving later in life. One of his tales from when he was young and stupid was seeing a http://www.cosmosmagazine.com/files/imagecache/news/files/20070509_wallaby.jpg curled up for a snooze. He did what anyone would do and started dragging it out of the spot it was in so he could get a better look. The Aussies he was with were telling him it was a bad idea... and got plenty of laughs when he noticed the claws and the wallaby woke up (they can move at over 30km/h [over 19mi/h], BTW

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For all of you wanting to visit Australia, I strongly recommend wearing a wide-brim hat with barbed wire on top to keep the Drop Bears off.
I'd argue with you about that, but there's so much a tourist has to do to keep safe from 'em that it'd take up a whole thread.
More seriously: For those of you eyeing Australia, be aware that Alaska is the only thing stopping it from being bigger than the continental USA. And we've got less than a tenth of the population, though that's besides my point. We have a wide rand of environment; from rainforests -both wet and dry- to deserts, to scrublands, to plains, to mountains... in the north you'll find people growing sugar cane, bananas, mangoes, and more, while where I grew up in Victoria it's mainly oats, wheat, and sheep. So if you do visit, try not to get stuck in Sydney, 'cause there's a hell of a lot more to see that's far more unique than yet another city

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Oh, and if you're a beer drinker, avoid the following brews:
Fosters: You may actually have trouble finding it, though, 'cause Australians don't basically drink it.
VB (Victoria Bitter): It has alcohol in it, and... uh, I can't think of any more redeeming qualities. Oh, it's generally rated better than Fosters.
Carlton draught: A little better than VB. Glowing recommendation, eh?
Tooheys: I actually don't know much about it 'cause it's more of a NSW thing, but I feel confident in assuming it's no better than Victoria's massive commercial beers.
XXXX: Same as above.
As with almost any country, microbreweries are the way to go.