Venture into the depths of Vai Tamaroa, one of Mitiaro’s most spectacular swimming caves. Reached by a 20-minute trek over grassy makatea, this hidden gem is a 10-metre (30-foot) deep circular sinkhole filled with crystal-clear water. A commemorative sign marks the trailhead, making it easy to find, but be prepared for a bit of climbing to enter and exit this breathtaking natural pool.