Alright, time for ego to glow.
If you do something like this, you do it to see the world and other cultures.
If you go to Australia... well, you might see the Sydney Opera House, which I hear is cool, the Great Barrier Reef is also pretty neat, and maybe some wildlife besides. But the continent is mostly desert, man. You're not going to make the most of a trip being there.
America has New York City, San Francisco, Los Angeles, Orlando, Las Vegas, Detroit, Huston, Honolulu, and Seattle. I'm listing the cities, because if I listed the tourist spots, I'd be here all night.
We're a nation of immigrants. We get newcomers like you ALL the time. Seriously. Been that way since the beginning.
I'm sorry that I don't know what Australia's like to its out-of-country residents, but it can't offer more than America.
/ego trip.