Sal Salis Ningaloo Reef, Australia

011/61/ 29/571-6399 or salsalis.com.au

Stay in roomy safari tents nestled in Australia’s western dunes. This resort borders a national park and offers from-the-beach access to coral reefs teeming with tropical fish.

Eco cred: Ningaloo has the bases covered with solar power and composting toilets. About 780 miles north of Perth, the retreat is free from light pollution, meaning great stargazing.

Insider’s tip: Swim with whale sharks, which migrate through the area from April to June. Sounds scary, but they’re harmless to humans.