A thick rope hanging from a tree over a green pool on the Río Fortuna. No ticket, no queue, no guide — which is exactly why people love it and exactly why it deserves a bit of respect. Here is what it is like, how to get there, and the safety part nobody puts on a brochure.

El Salto — "the jump" — is a local swimming hole, not an attraction. It sits on the Río Fortuna a few minutes outside La Fortuna town, where the river cuts a small gorge and pools up under the trees. Someone, at some point, tied a rope to a branch above it, and it has been there in one form or another ever since.
There is no gate, no ticket office and no opening hours. You park on an informal pull-off, walk a short path down through the roots, and you are there. There is usually a local keeping an eye on the parked cars who will expect a small tip — pay it, it is a couple of dollars and it is the closest thing to security the place has.
On a good day the pool is deep and green-blue, the rope swings you out over the middle, and you drop into cool river water with the forest closing overhead. It is one of the few genuinely free things to do in La Fortuna that people still talk about afterwards.

It is not a secret. There are usually people on the rocks, a second rope further along, and a queue of sorts for the main one. Go early if you want it quiet.
Click the video below to see the swing and the pool.
This is an unsupervised swimming hole in a river. Nobody inspects it, nobody is responsible for it, and if something goes wrong there is no lifeguard and no rescue boat — just whoever else happens to be standing there. Read that as it is meant: this can be a great afternoon, and it is entirely on you.
Before anyone touches the rope:

The nearest hospital is in La Fortuna town, and mobile signal at the river is patchy. If you are travelling with a group, keep one person out of the water and dressed.
From The Majestic Lodge in El Castillo it is about 36 minutes and 25.5 km — around the north flank of Arenal through Tabacón, through La Fortuna town, then out the far side. Paved except for the short gravel stretch at the El Castillo end. The turn-off is easy to miss, so use the map rather than looking for a sign.
El Salto takes an hour, so it works best bolted onto something else on the same side of the volcano — the La Fortuna Waterfall is close by, and the free hot springs river is the obvious way to warm up afterwards, since El Salto is cold.
Staying at the lodge makes the timing easy: it is a whole-property rental in El Castillo, so a group can leave at seven without negotiating with anyone, get the river to itself for an hour, and be back for a proper lunch. We can also arrange a driver, which matters here more than usual — the parking is informal and the last thing you want after swimming is a car that has been sitting alone on a verge all morning.
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$1,350 per night for the entire property — 10 en-suite bedrooms, sleeping up to 33, with breakfast included.
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