Australia UHV
- Export 7 resources (most likely candidates - Uranium, Iron, Wine, Gold, Coal, Sheep and Aluminium) in 2000
Why ? - Reflects the trade policies of Aus. We have trade agreements with the US, Japan, China, India, Russia...list goes on, but those are some pretty big markets. More Uranium here than anywhere else, big metal and wine exports to China, Large coal reserves, Sheep historically important). Problem is adding all those resources to Aus, which is essentially a desert continent. Although you can put some of that stuff in the desert...
Sign 3 Defensive pacts by 2000 (Possibly form a "Coalition" or 3-way alliance eg UK, US, Aus if that gets complicated since def pact is cancelled if one member declares war)
Why ? - ANZUS treaty, in the past there's been others (eg Indonesia I'm pretty sure) I'm sure there's others. Also might force you into an unwanted war (In reality this could be Iraq). Something that's not "open borders" (too many others have that) or "pleased" attitude etc.
Build an Olympic Park, a National Park and an Opera House by 1950.
Why ? - Hosted two Olympic games (Melb. 1956, Syd 2000)
- Kakadu national park/Uluru national park. Kakadu was really established in the 80's, Urulu well...tourism started in the 40's I think...
- Sydney Opera house (1973)
If that is too easy then Change the Olympic park wonder to require 4 Ampitheatres (Sports stadiums). Bigger countries tend to get the Olympics anyway. Too difficult and just move the date back.
UP
Power of resources
Other civs are willing to pay more

in exchange for your resources
Why ? - See strategy section...
Strategy
Early - The focus is those nat. wonders. They should be so early you can't really build alot else (like the Maya UHV, where you have to beeline Calendar, then Code of Laws, then start building that wonder straight away). You'll need the three in three different cities to suceed here too (Prob syd, melb and bris). If Brits don't found Adelaide and Perth though they take priority. You'll need Perth and Adelaide (possibly also Darwin) for those desert resources. They'll need

(Adelaide will likely be low pop high

city, that way you can get those desert resources. Reflecting reality, Adelaide "The city of Churches") since the sooner you get those desert resources hooked up the better (trade them, get your economy going). Brits will prob. get you involved in a war at some point (in reality - WWI) but its only an issue if its against Japan/China. You should be able to get through any early wars by way of other British territories (mainly India) taking care of Asian affairs. As the British empire declines you'll need to fight for yourself increasingly, towards the end zone of that first UHV condition you'll be fighting someone at your doorstep. If your trade routes are cut off you'll die a slow and painful death (No economy). (Japanese strategy for dealing with Australia should be to cut off trade routes rather than try to take the island. As it was in reality). You'll need to hold off the numerically superior Japanese (so take good defensive positions...) until someone comes saves you (in reality America and they'll prob. be the only ones who could help you here too...so suck up to them!). Once you deal with Japan, things get interesting. You'll probably by now have polarised relations with the AI. This makes it difficult for you to find new trades, which means if say, your trading Uranium to America, but they hook up a new source and cancel the deal, you won't have many options. Also, if you trade with say your allies enemies, then you both a) - make a potential war opponent stronger and b) - suffer worse relations and therefore AI could cancel that def pact you need for the UHV. You'll have some more wars no doubt, so will need to keep up tech wise, so will need

from trade (your land is mostly desert anyway, so unlikely to ever have alot of locally generated

)
UHV Condition one might be a given considering you'll need to be trading alot of resources anyway to run a decent economy...