I had an old friend from North Carolina come and visit a few days ago, and he only had a few days in the city. It was his first time in Sydney, and I wanted to really show him what Australia is all about. What do you do in this situation?
There are all the touristey things, which for me are the Sydney icons -- the Opera House, the Harbour Bridge, Taronga Zoo, etc. If they're a whiskey fan, we're definitely stopping by Baxter.
There are the condiments. Tutoring Americans on the proper spread of Vegemite is a favourite pastime, and Milo can go down well. Nutella has become so popular overseas that it's not seen as an Australian delicacy anymore. My go-to here is the Tim Tam Slam -- it's not extremely decadent, it's fun and novel, and every time I show a visiting game developer they go nuts for it.
There's the outdoorsey stuff, like going over to the three sisters, or if you've got some more time/money, maybe a little trip to Uluru or the Reef. My experience here is that Australia's reputation for spiders and snakes results in a high-pitched squeal as soon as you mention the possibility of camping. It takes coaxing, but there are some overnight hikes that are definitely worth it. Just bring some salt if it's been raining for a week beforehand!
What about you? Do you have any "Aussie experience" rituals you go through when people come to visit, other than the usual touristey things in the city? A favourite night spot you go to? Iconic food? Fun activity? Any shows they need to watch? Any hidden beaches they need to see?