“A coati steals a mango from a breakfast plate on the terrace and nobody moves to stop it — they just film.”

The drive from La Fortuna takes about twenty minutes on Route 142, which sounds simple until you realize the road narrows into a two-lane corridor walled by jungle that seems to lean in. Your driver — if you've hired one through the hotel or flagged a red taxi in town — will pass a string of zip-line operations, a couple of roadside sodas selling casados for ‏8 ‏$, and a hand-painted sign advertising a guy named Carlos who does horseback tours. The volcano is right there the whole time, Arenal, its cone so symmetrical it looks fake, except when clouds eat it entirely, which is most afternoons. You keep checking whether it's still visible. Thirteen kilometers west of town, the entrance appears on the left, modest enough that you'd miss it if you were looking for something grand.

The air changes before you see the water. It's the sulfur — faint, mineral, warm on the inhale. You smell Tabacon before you understand it. The lobby is open-air, which in Costa Rica means the lobby is also the jungle, and a pair of oropendolas are making their liquid, cascading call from a cecropia tree near the check-in desk. Someone hands you a cold towel and a glass of something with cas fruit in it. You're sweating already. You will not stop sweating for the next three days.

A river that runs hot

The thermal springs are not a pool. That's the first thing to understand. Tabacon sits on top of a natural thermal river — water heated by Arenal's volcanic activity — and the resort has shaped it into a series of cascading pools and channels that wind through twelve hectares of rainforest. Some pools are body-temperature gentle. Others are hot enough that you ease in slowly, making involuntary sounds. The hottest one, tucked behind a small waterfall near the back of the property, will turn your skin pink in minutes. A staff member named Mauricio told me the water enters the property at around 40°C, though it varies with rainfall. After a heavy downpour, the river cools and swells, and the whole system shifts.

The rooms are fine. Genuinely fine — clean, dark-wood furniture, a balcony that faces either the gardens or, if you're lucky, the volcano. The bed is comfortable and the air conditioning works hard, which you'll need because stepping from the thermal pools into a non-cooled room would feel like entering a sauna inside a sauna. But the room is not the point. Nobody comes here for the room. You come here to sit in a volcanic river at 9 PM with a Imperial beer balanced on a rock while tree frogs scream from every direction and the stars appear in the gaps between clouds.

Breakfast at the main restaurant, Esquinas, is a buffet with gallo pinto made properly — the rice and beans fried together, not served side by side — alongside tropical fruit you won't find names for in English. The fried plantains are excellent. The coffee is from the Central Valley and strong enough to counteract the boneless relaxation the hot water induces. Outside meal times, the resort's Ave del Paraíso restaurant does a decent ceviche, though the prices are resort prices, which means you're paying for the setting as much as the fish.

“You come here to sit in a volcanic river at 9 PM with a beer balanced on a rock while tree frogs scream from every direction.”

The spa uses volcanic mud in several treatments, which sounds like marketing until you sit in a dim room while someone applies warm clay to your shoulders and you realize you've lost track of what day it is. The resort also runs a guided nature walk through its own reserve — a patch of secondary-growth forest threaded with trails where a guide named Esteban pointed out a sleeping eyelash viper coiled on a heliconia leaf, roughly the width of a pencil. I would have walked directly into it. He seemed pleased by this.

The honest thing: the property is large enough that it can feel busy, especially when day-pass visitors arrive in the late morning. The thermal pools closest to the main building fill up. The trick is to walk further back, past the swim-up bar, past the second waterfall, to where the river narrows and the jungle closes in overhead. By late afternoon, you might share a pool with one other couple and a blue morpho butterfly the size of your hand. The WiFi works in the room and the lobby but gives up entirely near the pools, which might be the most therapeutic thing about the place.

Back on Route 142

On the way out, the volcano is hidden. It's been raining since 3 AM, the kind of rain that sounds personal, and Route 142 is glossy and empty. The soda near the zip-line place is open, a woman under a corrugated roof flipping tortillas on a comal. The driver slows for a sloth crossing — not a road sign, an actual sloth, halfway across the pavement, moving with the urgency of someone who has nowhere to be and knows it. You watch it disappear into the cecropia. Your skin still smells faintly of sulfur. You keep checking the rearview mirror for the volcano, but the clouds have taken it back.

Rooms at Tabacon start around ‏387 ‏$ per night in the green season, which gets you a standard room, full breakfast, and unlimited access to the thermal river — the thing you actually came for.