Everyone goes to Gran Cenote and Dos Ojos because they're Instagram famous. Result: packed tour groups and 350+ peso entry fees.

Cenote Azul near Playa del Carmen: 200 pesos entry, massive open cenote perfect for swimming and cliff jumping. Significantly less crowded. Bring your own snorkeling gear - rentals are overpriced everywhere.

Cenote Cristalino: Hidden gem 20 minutes from Tulum. Crystal clear water, incredible underwater formations, rarely more than 10 visitors. 150 pesos entry. Access road is rough but absolutely worth the drive.

Timing tip: cenotes are coldest mornings (24°C), so afternoon visits are more comfortable for extended swimming. Also bring biodegradable sunscreen - regular sunscreen is banned for ecosystem protection.