As an environmental activist, Leonardo Dicaprio bought an island called Blackadore Caye in Belize, more than ten years ago. The island suffered from overfishing, an eroding coastline and deforestation.

Mr. DiCaprio partnered with Paul Scialla, a New York City-based developer at Delos, to create the world’s first eco-conscious resort on the island. The luxury resort is scheduled to open for guests in 2018.