Excursion lists I've seen for various lines all seem to go to Chikin-Ha. I've done a handful of cenote dives in the past few years but I haven't been to this one or heard anything about it.
I know it's on the mainland so you will be taking the ferry over to Playa del Carmen and being met by your transportation (and maybe the guide as well) when you get off the ferry.
I see from your profile that you're a very experienced diver. Before you commit to the ship excursion you might want to check out a couple private guides and see what you can arrange on your own. If you got at least two divers, this might be a better option for you. I've had great dives with Dennis Weeks from Diablo Divers (mainland based, in Puerto Aventuras. He'll pick you up in Playa), and also with German Yanez from Yucatech Expeditions, which is based in Cozumel. German would meet you at the ferry pier in Cozumel.