Hook Island, Whitsundays, in January.

Most of all, though, we snorkelled. A long rocky shelf in front of Crayfish Bay is covered in coral, providing top-quality snorkelling. We went about nine times in four days.

Unfortunately, Jasmijn developed repetitive snorkelling injury (flipper sores), which were treated with my first aid kit.

To salve our consciences about our travel carbon emissions, and time off work, we cleared the litter from the entire length of the beach, and took it out with us. Plastic debris is washing up in quantities on remote beaches all over the world. There's even a sea of it collected by swirling currents, hundreds of km long, in the Atlantic Ocean. All of it is hazardous to wildlife. Many ingest it, and die.