Princess Mary spent two hours in the NSW mining town yesterday visiting the Royal Flying Doctor Service, smiling and waving as she stepped off a plane.

The heat prompted Princess Mary to take off her black cardigan as she greeted crowds, which in turn prompted a few cheeky locals to wolf whistle at the Danish royal.

Princess Mary laughed and wagged a finger at the crowd, spending more than 20 minutes with excited locals.

As she has done throughout her visit, she happily stopped to chat with children waiting to hand her flowers.

The Tasmanian-born princess toured the Royal Flying Doctor Service base and announced the appointment of the operation's first breast care nurse, who will travel the country by plane to provide support for families in rural and remote areas experiencing breast cancer.

Half the population of Broken Hill appeared to turn out to greet the princess and she seemed just as enamoured with their town.

``It's been an absolute pleasure for me to be here today, although it's a bit too short. I'd like to have more of a chance to see Broken Hill and all that it offers, but unfortunately that's not possible this time,'' Princess Mary said.

Crown Prince Frederik spent the morning in south-west Victoria inspecting the construction of the Macarthur Wind Farm.

Clad in a helmet and safety vest, he joked with executives from power company AGL and Denmark's Vestas, the world's biggest manufacturer of wind turbines.

For now, the site's paddocks boast sheep, bulldozers and the half-built towers of windmills that will soar as high as 140m when completed.

The project, costed at $1 billion, will be the biggest wind farm south of the equator, and may power more than 220,000 homes.

The royal couple will today spend their final day of their week-long official visit attending two events for the Alannah and Madeline Foundation in Melbourne.