While I was in Cozumel on my last cruise, there were 5 ships in port. The 2 Royal Caribbean ships were at 1 pier, 2 Carnival ships were at a 2nd pier, and 1 ship had to tender. Check CruiseCal.com to see how many ships will be in port when you are there. That may give you so idea as to how busy the port will be when you are there. Tendering is very easy, and it is a very short distance in Cozumel.
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Darlene
Mariner of the Seas
Carnival Magic Bloggers Cruise 5
Mariner of the Seas
HAL Statendam Alaska Cruise Tour - 09/09/12; Disney Magic - 12/01/12; Allure of the Seas - 05/26/13