Most of you guys will probably know this, but some threads I have looked at belatedly (I'm a "junior member" here, which is amusing to me since it's been a while since I've been considered to be a "junior" anything) imply to me that some folks don't realize that the ferry from Playa to Coz hauls people only, not people in their cars as do ferries as we tend to think of them here in the U.S. Renting a car in Cancun to drive to Cozumel won't work.