Cenotes are freshwater sinkholes or caves that you can snorkel and dive in. Natural wonders found throughout the Yucatan, several are located along route 307. A rental car will come in handy or you can arrange transportation through your hotel. Private companies on location at the cenotes arrange for guides, gear, and safety precautions; you can't go it alone. The best ones are Cenote Yax Mul, Dos Ojos, El Jardin del Edén, Tres Bocas, and Gran Cenote.
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Tulum, Quintana Roo