Once again, thanks for the replies everyone. I am back from Cozumel already, we ended up flying into Cancun and getting a rental car to drive to the ferry dock to get to the island (and a day late), rather than flying into the island as originally planned, due to recent US east coast weather.

The topes really are nasty! That's does seem to be the only thing to worry about, of course, to always regular common sense too.