Board a normal timber boat for a basic caldera tour, give up for swims, consult with the volcano
https://drbob.info/ekdromi-apo-kroyazieroploio-sti-santorini-o-apolytos-odigos-gia-na/
Board a normal picket boat for a classic caldera excursion, discontinue for swims, stopover at the volcano, and experience onboard memories and snacks.