Actun Tunichil Muknal (ATM) Cave Tour and Picnic — San Ignacio Day Trip to the Crystal Maiden
Wade across a crystal-fed pool and enter a limestone cathedral where geology and Maya ritual intersect. The ATM Cave Tour from San Ignacio pairs a jungle hike with a guided exploration of sacred chambers and the famous Crystal Maiden.
The Experience
Before You Go
Wear closed-toe, grippy shoes
Shoes will get wet and muddy; toes must be protected for rock scrambles and slippery passages.
Bring mandatory socks and a small towel
Socks are required for the cave’s dry chamber to protect sensitive surfaces; a towel and change of clothes make the return comfortable.
No cameras or electronics in the cave
Cameras are prohibited to protect artifacts and the cave microclimate—trust your guide to describe and photograph sensitive features when allowed.
Hydrate and eat a good breakfast
You’ll be active for several hours and lunch is served late—bring a refillable water bottle and light snacks for the trail.
Local Knowledge
Hidden Gems
- •Tapir Mountain Nature Reserve viewpoints—short detours reward broad ridgeline views over the Cayo Valley
- •The ranger station picnic clearing—quiet spot to linger after the tour and watch forest edge wildlife
Wildlife
- •Howler monkeys
- •Keel-billed toucans
Conservation Note
The cave is protected and tours follow strict rules—no touching artifacts, no cameras, and mandatory socks in dry chambers—to minimize human impact on fragile formations and cultural material.
ATM served as a sacred Maya ritual site and burial place; archaeologists have recovered pottery, stoneware and the calcified remains known as the Crystal Maiden.
Photographer's Notes
- • Entrance pool (wide-angle silhouettes)
- • Trail clearings near the ranger post (forest canopy frames)
- • Picnic clearing after the hike (wildlife and valley views)
What to Bring
Closed-toe hiking shoes (that can get wet)Essential
Protects feet on slippery rocks and through jungle streams.
Socks (pair to leave on for dry chamber)Essential
Mandatory in the cave’s dry chamber to reduce surface wear.
Quick-dry clothing and swimwearEssential
Dries fast after the swim and keeps you comfortable in humid conditions.
Reusable water bottle (1 liter+)Essential
Hydration is crucial in tropical heat; guides can refill bottles.
Common Questions
Are cameras allowed inside the cave?
No—cameras and electronics are not permitted inside ATM to protect artifacts and the cave environment; guides may take photos of sensitive areas for research or visitors.
Can non-swimmers participate?
Yes—lifejackets are provided and guides escort weaker swimmers across the entrance pool; you will still need to wade and move through shallow water.
Is the tour suitable for children?
Children above the 40-inch minimum can join, but the route involves swimming, uneven terrain, and time in confined spaces—consider the child’s comfort and stamina.
What should I wear for modesty rules?
Modest, functional clothing is required—no bikinis, minimal straps, or sleeveless tops; shorts and swimwear should be conservative out of respect for the site.
How physically demanding is the hike?
Expect a moderate hike with low elevation change but uneven, root-strewn trails and slippery sections; a basic level of mobility and stamina is needed for several hours of activity.
What happens in bad weather?
Heavy rain or flooding can close access for safety; the operator may cancel and offer a full refund if conditions make the tour unsafe.
Book This Experience
Check AvailabilityDuration
9 hours (full-day)
Location
San Ignacio, Cayo District
Difficulty
moderate
Fitness Level
Moderate fitness—comfortable on uneven trails, able to swim short distances or float with a lifejacket, and manage several hours of slow-paced walking.
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