At Greenhorn Ranch in California’s Sierra Nevada mountains, my best friend of 15-plus years resembled a stranger.

Armed with a disproportionately large rifle, Ellie took aim and nailed three clay pigeons in perfect succession — her first time ever wielding a gun.

As our skeet shooting instructor clapped, I stared at Ellie incredulously. “Who are you?” I joked. “And where did that skill come from?”

Although Ellie and I grew up together in rural New Jersey, new places continue to reveal new facets of ourselves. When we turned 18, we started, and have since maintained, annual trips that have brought us all over the world.

Whether we’re traipsing…