Prince Charles and Camilla indulged their passions for literacy, heritage architecture and environmentalism on the final day of their tour of Australia and New Zealand.
It began with a Sunday morning church service at St George's Cathedral in Perth, where they were greeted with a curtsy from Marie Pinelli, seven, and her sister Sofia, eight, who gave Camilla some freshly picked flowers from their garden.
"The Duchess thanked them for the curtsy and said it was lovely," mother Anne Barisic said.
About 450 parishioners squeezed into the cathedral and the service included prayers for victims of recent terror attacks.
The royal couple greeted hundreds of people after the ceremony, then split to do different activities, with Prince Charles walking across the Cathedral precinct to officially open the State Buildings.
A known admirer of heritage architecture, the prince was clearly impressed by the 140-year-old structures and was happy to talk with several craftspeople involved in the restoration.
Previously known as the Old Treasury Buildings, the three interconnected heritage buildings include a vibrant retail, dining and hotel complex.
Charles unveiled a plaque and told guests, including the premier, state cabinet ministers and religious representatives that he could imagine the effort and dedication required to restore the buildings.
"For quite a large part of my life, I've tried to help find new uses for historic buildings," he said.
"So many of them convert brilliantly for other uses, so I'm thrilled to see this building being put to such wonderful use."
Then, like Charlie in the chocolate factory, Prince Charles appeared to be in his element when he visited the WA Seed Technology Centre.
The avid gardener and environmentalist asked several questions as he learned about native plant species' drought responses, adaptations in bushfires, breeding and ecological restoration.
Meanwhile, the Duchess of Cornwall visited the State Library of WA and participated in an informal family literacy program for culturally and linguistically diverse families.
She also met Aboriginal people involved in the Storylines program aimed at preserving culture and community links.
The royal couple reunited at the 750-year-old Giant Boab tree in Kings Park where thousands of people gathered to shake their hands, offer flowers and sing happy birthday to the prince.
Their Royal Highnesses also met Olman Walley, who played the didgeridoo and gave them two boomerangs he made.
Prince Charles described the didgeridoo music as "amazing", while Camilla said if she threw the boomerang it would not return.
"I won't do it," she quipped.
They were then escorted by Premier Colin Barnett and his wife Lyn to the Flame of Remembrance at the State War Memorial.
The Royal Highnesses were then whisked away to the airport to leave Australia.
It was the fifth time the Prince of Wales had visited WA and the first visit for The Duchess of Cornwall.
