Ischia

Capri may be the most famous island in the Gulf of Naples, but Ischia can lay claim to being the largest. Which is a good thing, because folks like to come and visit; Ischia welcomes about 6 million visitors every year. 
Tourism is the main industry on Ischia thanks in part to volcanic activity that’s created much sought after hot springs. Thermal spas lure many visitors to the island, but with 37 km (23 miles) of coastline, there are plenty of things to appreciate about island life and finding a place to call your own isn’t impossible.
Be sure to visit Castello Aragonese (Aragonese Castle) at Ischia Ponte. Built in the 15th century, it was once tasked with protecting the island from pirates.

Practical Info

Most ferries and hydrofoils run from Naples to Ischia Porto, the main town. The one-way trip takes about an hour.