Get ready for a truly special experience at the Grotta Verde, a stunning sea cave you can only reach by boat. Once you arrive, you'll need to swim from your boat to enter the grotto, where you'll be rewarded with the sight of emerald light filtering through the water. It's an intimate and adventurous way to see one of the island's natural wonders, perfect for a quick, memorable dip before continuing your exploration of Ischia's beautiful coastline.