Playa Marlin, at Km 13 along Boulevard Kukulcán, is in the heart of the Zona Hotelera is accessible via a road next to Kukulkán Plaza. It's a seductive beach with turquoise waters and silky sands, but like most beaches facing the Caribbean, the waves are strong and the currents are dangerous. There are currently no public facilities, but if you need a restroom, you can always walk over to Kukulkan Plaza.
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