IMMERSE YOURSELF in a Secret River with Plus ADVENTURE with Bike route & Rappel

Beneath the Riviera Maya's limestone crust runs a network of underground rivers, and one of the largest — known as Rio Secreto — opens onto a full day of movement both above and below ground on this Plus Adventure tour. It pairs a cavern swim with a bike route and a rappel descent, so instead of a single activity you get a sequence of them, each delivering you deeper into terrain the Maya once called Xibalba, the underworld.

The day starts with hotel pickup in an air-conditioned van bound for the Riviera Maya. On arrival, staff fit you with a wetsuit, a helmet mounted with a flashlight, and special shoes built for wet, uneven rock. From there the itinerary moves through its stages: a bike route across the property, then a rappel down into the cave system itself. That descent puts you at water level in front of stalactites and stalagmites formed over geological time, each one distinct in shape. As you continue through the passages, a light-and-sound projection plays across the natural rock formations, turning the cavern walls into something closer to a canvas than raw stone.

Once you're through the rappel and the projection sequence, the tour turns to its centerpiece: swimming through the clear water of the underground river itself. Snorkeling equipment is provided, so you move through the cave at eye level with the water, tracing the same channels that carved this rock over millions of years. A specialized guide stays with the group throughout, narrating the geology and the history behind the formations as you go. There's also a separate dry route included, walked rather than swum, giving you a second vantage point on the same cave system before the light-and-sound show. The full experience runs about six hours door to door.

This tour suits travelers who want more than a passive float through a cenote — the bike segment and rappel descent ask for a genuine physical commitment, and the operator is explicit that participants should have at least a moderate level of fitness. It is not recommended for anyone with spinal injuries, poor cardiovascular health, or severe physical or motor impairment, nor for pregnant travelers. There's a minimum age of 7 and a maximum recommended weight of 120 kg (250 lbs). Within those bounds, it works well for active families with older kids, small groups of friends, or solo travelers looking for a fuller day underground than a standard swim-only cave tour offers.

All core gear is handled on site: the wetsuit, helmet with flashlight, and special footwear come with the package, as does use of snorkeling equipment for the river swim. Lockers and towels are provided too, so you can travel light and change before and after without hauling wet gear around. A buffet meal and a flavored drink are included once the underground portion wraps up, giving you a chance to refuel before the ride back.

Round-trip transport from your hotel is part of the package, arranged in advance — if your hotel isn't on the operator's standard pickup list, a representative will reach out directly by email or text to confirm the exact time and location, since pickup schedules vary by property. Photos and videos taken during the tour come at an extra cost, and souvenirs aren't included, so budget separately if you want a record of the descent or want to bring something home from the site.