Trek the volcanic island of Nea Kameni, walk earlier steaming vents, gain knowledge of geology out of your guideline
https://johnathanpkno631.theburnward.com/top-santorini-island-tours-from-caldera-views-to-winery-tastings-and-hidden-villages
Trek the volcanic island of Nea Kameni, walk previous steaming vents, study geology from your book, and soak in regional sulfur warm springs.