Do I need a visa for Sanya

Hello I'm an Australian passport holder booked on a Royal Carribbean cruise in October, this trip includes return flights back to Australia.The package flys us to Hong Kong where we board the cruise ship leaving Hong Kong to Singapore for 7 nights with a 8 hour stop over in Sanya (shipping port) then proceeding to next destination (Vietnam) do I need a visa for PRC even though I will not be disembarking. The whole trip is 9 nights return regards Tracey