More authentic food than this, very difficult.

Fresh fruit at the main square, this ladies sell all kind of fruit, already sliced and ready to munch, you can pick from what the already have prepared or ask for a special combination of fruits.

La Tarraya, the first restaurant in Playa (or so they claim), fresh seafood with very Yucatecan flavor. Cheap prices and very good cuisine.
Tacos Arabes "Israel"
Tacos al pastor are a variation of Tacos Arabes, main difference is that "arabes" have no marinade with achiote.
This is the salsas table, from extremely hot on the left to mild on the right. Don´t forget.

El Cejas.
24th Street & 30th Ave. Not in the touristic zone of town.
Seafood restaurant with origin in Mercado 28 from Cancun.
Very nice selection and very fresh seafood. Medium ranged prices.