We were staying in Imerovigli. The shuttle picked us up right on time 9:05 am, for a day sail from Ammoudi Bay around to the southern side of Santorini. The bus dropped us off and we got in line where the check in desk gave out different colored cards, each for different cruises that morning. We were blue, and at 10am, the boat pulled up for us. The catamaran was spacious inside and had plenty of room out front for all of the passengers to get remarkable views. First stop was the lava formations in the caldera to get a swim in. The water was colder than I expected as there is an active volcano under the seabed. There is a smell of sulphur, which the guides tell you about before you jump in. Next was the sailing past the Akrotiri Lighthouse to White Beach. We had lunch and swim time. We were there about 1.5 hours, then heading to Red Beach for about 20 minutes. The waves were a bit choppy, so I would recommend taking Dramamine before getting on the boat. The food was surprisingly good (eat the shrimp!!!), and beer, wine, soda, and water is offered to the group during the entire trip. It might be the best way to see Santorini!