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Yes, I agree a day trip to Isla Mujeres is a must! As a tip, walk a few blocks south of the ferry to get cheaper golf carts than right at the ferry entrance.
I’ll also say that the airport is INTENSE after exiting with your bag.
Dozens of people will try and get your attention to “help” you with your transportation.
Don’t listen to anyone unless they have an airport ID badge, and just don’t engage the rest.