Sysney is a city in the southeast of Australia. It isn't the capital. Canberra is the capital, but 3.5 million people live in Sysney and only 320,000 people live in Canberra.
If you're good at surfing, go to Bondi Beach. If you're interested in music, go to the Opera House. And if you're interested in food. Australian food is fantastic.
And remember! Australians speak English, So, come and practise your English in Sysney!