"Fleur de lee viper," German explained in a hushed tone. "It's the deadliest snake in all of Central America. Two venoms, one for the blood, one for the nervous system."

Needless to say, after encountering a snake whose bite delivers a 99 percent fatality rate and a one-hour death sentence, the promise of swimming in the crisp pools underneath Unbelievable Falls seemed downright suicidal—until I reached the falls. By then, my body was drenched in sweat and the momentary panic of the viper sighting had been overtaken by an overwhelming need to cool off. And while the name of the falls were something of a misnomer—remarkable more than unbelievable—a 15-minute swim in the Visine-clear waters perpetually replenished by the cascading falls was sheer tropical heaven, and it primed me for the second stretch of the hike, which started by crossing the river before ascending several hundred feet up steep switchbacks that cut into the belly of a rainforest-choked ridgeline.

We hiked for the next three hours, pausing at overlooks that profit views of the frothing waves of the Caribbean just beyond the jungle's green horizon, the gentle slopes of the mountains, clouds snared in its trees. We navigated treacherously slippery rocks, leapt over babbling creeks, paused to catch our breath at one of the property's benches, and encountered another snake—this one a jumping viper, not as deadly as the fleur de lee, but still endowed with deadly venom—before returning to the lodge restaurant for a hearty lunch.

The half-day hike complete and the food steadily digesting, I felt justified in partaking in Pico Bonito's other stellar accomplishment: the blissful art of lazing about. Returning to the porch hammock, I read to the tune of afternoon rain pelting the rainforest canopy and let the day grow into evening, then an inky black night. Later, a long meal at the on-site restaurant, an after-dinner drink, and easy conversation with the bar staff, returning to my cabin…

The Lodge at Pico Bonito has so successfully executed the art of both activity and relaxation that I'd actually lulled myself into confusing my departure date, believing I had another full day to imbibe on the resort's allure. Luckily for me, beneath the guise of tranquility lies a vein of professionalism that inspired the desk clerk to call and rouse me for my nine o'clock flight that next morning. If it weren't for her, I might have never left.