The trail starts on the side of Santa Cruz beach, in Banda Abou, on the western part of the island. You follow the coast northwest on a dirt and rock path that climbs before leveling off, with the turquoise sea below for nearly the entire route.
First natural stop: Playa Pretu, a small dark-sand cove whose name literally means black beach in Papiamentu. It's the perfect spot for a shaded break before continuing on toward the promontory overlooking the Blue Room, the sea cave where sunlight filtered through the water creates a blue glow inside. You reach the cave by swimming from the rocks, either jumping in or carefully climbing down to the water. A mask and snorkel are essential to enjoy the inside of the cavern. The return trip follows the same trail.
Plan on about 45 minutes to 1 hour of walking each way, depending on your pace. The path is rocky and largely without shade, so closed shoes, plenty of water, and sunscreen are essential. It's a simple, free way to reach the Blue Room on foot, away from the boats that shuttle back and forth from the beach.
The real payoff comes at the top of the promontory: beneath your feet, the limestone opens onto water so clear you can make out the cave entrance before you even jump in.
