This was the coolest thing we did in the Cayo! I'm in average shape and it was easy. We went with Pacz tours out of San Ignacio and Oscar was our guide. We wore our swim suits with a quick-dry shirt over, neoprene socks (designed for snorkeling fins), and wet/dry sandals that had a closed toe. Our tour provided box lunches for us. I would recommend bringing ziplock bags to put that lunch into (it came in a carboard box). There are pit toilets and changing rooms at the parking area on arrival. Bring a set of dry clothes and leave it in your vehicle for when you return. You take a 45 minute easy flat hike that crosses 3 rivers. The river crossings aren't hard but you will be waste-deep during the first one and about knee-deep for the other two. The river bottom is rocky but if you go slow, you'll be fine. After the 45 min hike, you reach a picnic area (w/ pit toilets). Have a snack there then suspend your backpack on a nail from the picnic pavillion to keep the ants out. Well, my pack got invaded by ants even though it was suspended (thus I recommend ziplok bags). Or make sure your back has zippers that lock closed tight (mine had the tiniest of gaps and the ants found their way in). Anyway, a small path leads to the mouth of the cave. Your guide gives you a helmet w/ lamp. You swim across the opening of the cave...the water is cold but not painful and it takes all of 30 seconds. There is about 15 minutes of navigating the cave that is slightly technical (but not scary or undoable by any means). The guide will say "put your foot here, turn like this, and step down". Then there is about 30-40 minutes of easy caving that involves walking through water that varies from ankle deep to chest high (or flat out swimming). All is very easy as long as you look at your feet and watch where you step! Then you begin a climbing section to reach the dry section of the cave. This could be a little scary for some but again, our guide told us exactly where to put our feet on the way up and even as a short overweight person, I had no difficulty. You take your shoes off for the dry section to avoid harming any artifacts in the cave. Having neoprene socks on helped since they were a little more cushioned. You spend time in the dry section examining Mayan artifacts. The last part of the dry section involves climbing a metal ladder (it's secure). As far as cave formations go, I've seen more impressive, but you can't beat the water experience, how impressively large this cave is, and the Mayan experience. The only light you have is from your headlamp so don't expect any fancy dramatic lighting effects. After your experience, you can change into dry clothes back at the parking lot in the changing rooms.
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