Trek the volcanic island of Nea Kameni, walk past steaming vents, examine geology from your book

https://blogfreely.net/thoineikis/santorini-daily-tours-what-to-expect-and-how-to-choose

Trek the volcanic island of Nea Kameni, walk beyond steaming vents, be trained geology out of your booklet, and soak in within reach sulfur hot springs.