The boat tours give visitors a chance to see the island from the vantage point of the sea, with its jagged coasts, grand seaside hotels, and hidden coves of thermal waters. Views that are particularly interesting from sea include the imposing Aragonese castle, the village of Sant'Angelo, or the "mushroom" of Lacco Ameno. Ischia's most famous sea cave is the Grotta del Mago, with its striking silver and blue hues.

Boat excursions around Ischia depart from Forio and Ischia Porto. The perimeter of Ischia is quite vast, so you need to consider at least half a day to do the complete tour with stops to swim in some of the most beautiful bays. Since many tours offer lunch on board and several swimming stops, the tour can last an entire day.