I just returned from a week in Cozumel diving with a Cozumel dive operator doing 2 tank a.m. dives daily. I was able to book a single tank afternoon cenote on the mainland after the morning dives. I had prearranged the cenote dive online and knew I had 2 other divers wanting to go. After the 2 morning dives we taxied into town and had a quick lunch at the Burger King on the Pier. We took the 2p ferry to Playa del Carmen and met the dive operator at the PDC pier. We booked with Dennis at Diablo Divers and he took us from the pier with our gear on a short drive to Chac Mool Cenote in a very comfortable 4 door pickup. We did our dive and returned to the PDC pier in time for the 7p ferry back to Cozumel. We made it back to our hotel in Coz to meet the rest of our dive group for dinner at 8:15p. The excursion to do the afternoon cenote was very well worth it. While we did need to stick to our plan, we did not feel rushed or hurried. I cannot say enough about the professionalism our our operator who gave us a very thorough dive briefing (probably the most thorough I've ever had).