Embark on a unique adventure with a reef walk or headland scramble to The Three Grottos, a breathtaking series of crevasses and sinkholes along Atiu’s coastline. At low tide, stroll through knee-deep crystal-clear waters from Oneroa Beach, experiencing the island from a whole new perspective. Alternatively, look for markings on the trees along the main road that indicate short trails to the clifftop viewpoints. Either way, you’ll reach two (not three, despite the name) stunning grottos.