We loved this tour! Our guide was informative and interesting. The lunch was good and the museum tour was educational and not too long. Delphi is a gorgeous place-- if you are visiting Athens, be sure to travel up to Delphi.
This was a good tour, but we didn't realize how much time would be spent on the boat. We were out for about 13 hours and we were only off the boat for about 3 of those hours. The lunch wasn't amazing. Still, seeing the island of Hydra made the trip worth it-- it is an incredibly beautiful island. There's probably no better way for a tourist to see these three islands in one day; just be prepared for a lot of time on a boat!