Gran Cenote

Gran Cenote earns its definite article by variety: it is not one pool but a sinkhole garden - a ring of turquoise basins joined by boardwalks and cavern passages, planted with palms and lilies, where the Sac Actun system surfaces prettily enough for postcards. The water does the convincing: glass-clear over white sand and rock shelves, shallow enough for beginners in the open sections, then ducking under stalactite-hung arches where snorkelers glide through half-lit galleries between the two main mouths. The residents seal the reputation - freshwater turtles cruise the lily margins with celebrity indifference, small fish school under the decks, and bats flicker in the cavern ceilings. Being ten minutes from Tulum on the Coba road, it is the town's default first cenote and prices accordingly, with turnstiles, mandatory showers, lockers and lifeguards keeping the flow orderly. At opening, before the vans, the garden is close to perfect; by midday it is a cheerful, crowded aquarium of humans and turtles negotiating shared water.

What you actually see

• The turquoise basins - linked pools around the sinkhole garden.
• The cavern arches - snorkel passages under stalactites.
• The turtles - resident paddlers among the lilies.
• The boardwalk ring - decks and ladders circling the water.

When to go

At opening, any season, for the water at its stillest and the turtles boldest; late afternoon offers a second lull. Dry months bring the strongest light shafts.

Honest expectations

It is the area's most visited cenote - midday means queues, whistle-happy lifeguards and shared lanes. Prices run high for the region. Sunscreen is banned outright; shower first and swim clean.

Nearby

Cenote Calavera is minutes back toward town; Carwash and the Coba road's whole cenote belt continue west; Dos Ojos lies twenty minutes north on highway 307.