Board a usual picket boat for a traditional caldera tour, quit for swims, talk over with the volcano
https://jasperdqhm206.publishlane.com/posts/private-santorini-tours-tailor-made-itineraries-for-every-traveler-3
Board a conventional timber boat for a classic caldera excursion, stop for swims, discuss with the volcano, and experience onboard stories and snacks.