After clearing customs, before you leave the secured area you will be met by people lined up stating they are travel advisors, walk right past them, they are time share sales people
If you have never flown into Cozumel, you will discover that transportation to your hotel and dive shops are performed by two vendors. Coming out of the secured area, straight ahead you will see the vendor Concessions. Cozumel Shuttle and Flexi Shuttle
When purchasing your fare, advise the agent of your Hotel Name or the address of your private accommodation. You will have a choice of a private shuttle or a shared Van
If you are arriving by way of Cancun, you will have to take a taxi, private shuttle or bus to Playa Del Carmen (approx one hour), where you will catch the passenger ferry over to Cozumel. There are 3 companies that run the ferry Service. Ultra Mar, WinJet and Xcaret Sailing. Buy only a one way ticket so that on your return you can take the service closest to your personal departure time.