I will never forget my first morning hike on Sumba, a small island the size of Massachusetts that sits halfway between Java and Papua New Guinea in the Indian Ocean. The trek began on a stretch of Nihi Sumba’s nearly two-mile private beach where colossal, moss-lined boulders protrude from the sea, revealing themselves each afternoon at low tide. We then cut into untamed jungle and across expansive rice paddy fields that almost flowed into the ocean. It felt like a scene from an adventure movie w...