This excursion was turtle-ly brilliant sorry! After a short ride from our resort on Laganas to Agios Sostis on an air conditioned coach we boarded a comfortable and well equipped bar/snacks/toilet large wooden boat which took us out to a popular viewing area just off Laganas, where we didn't have to wait too long before a gorgeous female turtle made an appearance. Sue, our fabulous tour guide, had given us lots of interesting information about the turtle population on the island en route and about the island itself. She is extremely knowledgeable and very entertaining! After we had all had a good look at the turtle, we headed off to and around Marathonisi Island, avoiding the busy Laganas side we headed to the opposite side for a swim stop, where we swam through a cave and snorkelled around the boat, the water was lovely and cool and so clear, a fantastic experience! Obviously the boat can only get so close to the shore so very deep initially but my three boys aged 11, 10 and 6 all got in and loved it. We stopped there for about 40 minutes then clambered on board again and sailed towards the Keri Caves for a photo stop. If you are looking for a family friendly trip, that is fun, educational, and beyond picturesque - this is the one for you! Brilliant value for money, the Captain and crew were helpful and friendly and Sue was an excellent guide.