Trek the volcanic island of Nea Kameni, stroll previous steaming vents, study geology from your e book
https://archerawrd351.tearosediner.net/santorini-day-tour-itinerary-a-perfect-one-day-plan-to-see-the-island-s-top-highlights-2
Trek the volcanic island of Nea Kameni, walk past steaming vents, be told geology from your guide, and soak in nearby sulfur hot springs.