We took the Caretta Caretta tour with Golden Dolphin today from Alykanas. Transfer from Alykanas to the boat is 30 minutes.
You need to walk through the sea to get on and off the boat. Take aqua shoes and wear shorts/swimwear, the water will go up to your thigh.
The boat will visit a harbour as well as the islands (goes inside the caves) in an attempt to spot the turtles. No guarantees but the captain tried very hard and we got to see the turtles more than once.
There is a swimming stop on the island for an hour, long enough to get an ice cream/frappe from the beach bar and have a wander to see the turtles nesting or have a dip in the sea.
No complaints really, a lovely little excursion to break up the week and good value for money in my opinion.
€25 per adult, €20 for children. At the beach bar it's €5 for a hotdog, €4 for a frappe/ice cream. They accept cards. Do take cash if you want to tip the bus driver/boat captain.