You have to do the Blue Hole at least once in your lifetime. Also, having made numerous trips to Cozumel for the diving, would venture to say that the Turneffe sites are as good as, or damn close, to the reef in Cozumel. Also, AC is much nicer above the water. Cozumel go too big, stoplights, a second gas station, where is it going to end? AC is the best. And Belikin is far superior to Corona. IMHOP
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Been there, done that, the washing machine ate the T-shirt