Pinasil Island is famous for the Cathedral Cave, a cathedral-like cavern accessible by dinghy and kayak. Its cool interior is lit at certain times of the day by sunlight coming through an opening at its peak. This one of important sites for the busyadors or the birds' nest gatherers.
It’s not possible to swim inside the cave due to the strong currents. The cave is also home to venomous sea snakes.
The Cathedral Cave is part of El Nido's Island Hopping Tour B.