No ferry, and I understand it would probably be a very rough trip.
Last time I took the ferry from Playa del Carmen, there were lots of people sick. Even me, who always thought I had a cast iron stomach was feeling pretty nauseated.
There is no ferry and I've not heard of any private trips. I would imgaine it would a long and very expensive boat ride, even if you could find someone to take you. The ferry from PDC to Cozumel takes 45 minutes and Isla is about an hour south of PDC. Since I'm not a boater I've no idea whether the conditions would even allow such a trip.
You're going to have to go by land to Playa del Carmen and catch the ferry there.
Thanks for the info.
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