Board a usual wooden boat for a conventional caldera excursion, end for swims, visit the volcano
https://www.scribd.com/document/1037270800/Private-Santorini-Tours-Luxury-Itineraries-Sunset-Moments-and-Hotel-Pickup-Made-Easy-133618
Board a basic wood boat for a traditional caldera travel, end for swims, visit the volcano, and appreciate onboard memories and snacks.