Simon travels travels down the east coast to the magnificent cities of Sydney and Melbourne in the final part of his journey. Simon's journey starts in Surfers Paradise near the city of Gold Coast, the Las Vegas of Australia. Behind the sun and surf, this area has become the organised crime capital of Australia. Police are cracking down on outlaw motorcycle clubs, accused of being criminal gangs. Simon meets the most notorious and feared biker group in Australia to hear their side of the story. In the wealthy East Coast suburbs, Simon has a different kind of encounter, joining a vet and his team who rescue and treat injured koalas - thousands of which are killed each year by cars and pet dogs. Arriving in Sydney, Simon discovers a city of huge cultural diversity closely linked to its booming Asian neighbours, India and China. One in ten Aussies are now of Asian origin.

• Simon Reeve