I did the Jeep ride in Milos and checked out the major mine and hot springs. The trip was a cruise with Milos being the last stop before returning to Athens. I also visited Thessaloniki, Kusadasi (Turkey), Crete, Santorini, and Mykonos. I hiked an active volcano in Santorini. I saw a lot of Biblical sites, including the House of Mary near Ephesus, which is also where the Apostle Paul preached against the established Greek gods. I learned that the Starbucks logo comes from the Greek god, Artemis.
I definitely want to go back to Greece and checkout Mykonos and Milos some more. Santorini is a one and done experience to me. Athens is a really cool city. The people are super friendly to Westerners.