We sailed on the Conquest in February. When we stopped in Cozumel, we docked at the pier further away from downtown. The El Cid is right there in front of you. We paid $35 for the day, and could come and go as we pleased
( good if you need to go back to the ship for anything ) We really enjoyed our day. The snorkelling was very good - the most fish we saw all week ! The food and drinks were great.
The walk from the ship if you dock at that pier was about 5 minutes. If you dock downtown, I think you would need to take a taxi