Just a short jetty ride from Vanuatu’s main island of Efate, Hideaway Island is home to both beautiful beaches and a charming resort. But it’s most famous for something you can’t see in this picture -the world’s only underwater post office. That’s right, don your snorkel gear and swim out a bit from the shore to mail a postcard home from this unique sunken postal facility. Waterproof postcards are sold in the gift shop along with the special pencil you’ll need to address it. On days when a cruise ship is in port, the resort has a diver who acts as postmaster general to accept your postcard. On other days, just dive down deep enough to drop it in the box yourself. My postcard took about 2 weeks to make it back to me in Atlanta and is one of my favorite souvenirs!