Kate Middleton and Prince William visit Tuvanipupu Island on September 17, 2012. Credit: Samir Hussein/WireImage.com

Turns out Prince William and Kate Middleton both like pina coladas -- and getting caught in the rain.

The royal couple, currently touring the South Pacific on behalf of Queen Elizabeth II for her Diamond Jubilee celebration, got to squeeze in a romantic, honeymoon-like evening together on the private resort island of Tavanipupu, located in the Solomon Islands.

Will and Kate, both 30, slept in a private, $1,260-a-night, leaf-thatched bungalow boasting lavish amenities -- including a large outdoor shower area, a fridge fully stocked with expensive champagne and fresh fruit, and a cappuccino machine.

"I was astounded at how down to Earth and lovely they were. They just seemed to love it," the resort's co-owner, Pamela Kimberly tells Us Weekly. "They were happy and relaxed."

Almost immediately after their arrival, the royal pair sipped on freshly-made pina coladas (William "had two!") and then "got straight into snorkeling."

Later, despite an evening downpour, they insisted on dining outside (underneath a bamboo gazebo at the end of their bungalow's jetty), where they noshed on locally-sourced seafood and produce. (Among the items featured on the resort's menu? Chili mud crab and Ikamata, a local dish of yellow fin tuna sashimi cured in lime juice, coconut milk, ginger, garlic and spring onions, served in a coconut half.)

"They couldn't have been more complimentary about the island," Kimberly shares. "They said they would definitely tell their friends about it. And that meant a lot to us."