Mexico's largest island is directly across from Playa del Carmen. The scuba diving off Cozumel Island was made famous by Jacques Cousteau and the island is one of the Top 3 diving destinations in the world.
Before there was tourism in Playa del Carmen or Cancun, there was Cozumel Island. The shopping in Cozumel is first rate.
Ferries depart from Playa del Carmen regularly for the 30-minute crossing. The Cozumel ferry leaves from the dock next to the main plaza in Playa del Carmen