Resort Hot Springs vs the Free Thermal River in Arenal

A warm, honest comparison of the two main ways to soak in Arenal’s geothermal waters: resort day passes and the free thermal river, with tips for choosing what fits your trip.

When you visit Arenal, the hot springs are almost a rite of passage. The volcano’s geothermal activity heats the groundwater, and you have two main ways to enjoy it: a resort day pass with manicured pools, or the free thermal river that runs through the public area near the bridge. Both are wonderful, but they offer very different experiences.

I’ve soaked in both many times, and I’ve learned that the right choice depends on your budget, your tolerance for crowds, and what kind of relaxation you’re after. Here’s a field guide to help you decide.

Resort Hot Springs: Comfort and Convenience

The resorts along the road from La Fortuna to the volcano have built elaborate hot spring complexes. For a day pass (typically from $30 to $80 per person, indicative), you get access to multiple pools at different temperatures, clean changing rooms, lockers, towels, and often a swim-up bar or restaurant. The water is filtered and recirculated, so it’s clear and warm, usually between 95 and 104°F. The pools are landscaped with stone, waterfalls, and tropical gardens. It’s a polished, predictable experience. If you want to sit in a warm pool with a drink in hand, no mud, no rocks, and no surprises, this is your spot.

The Free Thermal River: Wild and Authentic

Just a short drive from the resorts, there’s a public access point to the thermal river. You park on the side of the road (look for the bridge and the small parking area), walk down a short trail, and find yourself at the riverbank. The water here is naturally heated by the volcano, and it flows over smooth volcanic rocks. You can find spots where the temperature is just right by moving a few feet. It’s free, open to everyone, and feels raw and real. The river bottom is rocky, so water shoes are essential. There are no facilities, no staff, and no guarantee of privacy. But the experience is unforgettable: sitting in warm, moving water, surrounded by jungle, with the sound of the river and birds around you.

Which One Should You Choose?

If you’re on a tight budget, traveling with kids who need safe, shallow pools, or you just want a hassle-free soak with amenities, go for a resort day pass. Book early in the day to avoid peak crowds, and bring your own towel if you want to save on rental fees.

If you’re adventurous, don’t mind a bit of mud, and want to feel the real geothermal energy of the volcano, the free river is a gem. Go in the late afternoon when the light is golden, and bring water shoes, a towel, and a trash bag to pack out your waste. Leave the river as clean as you found it.

A Note on Safety and Etiquette

The thermal river is not patrolled, so be cautious. The rocks can be slippery, and the current can be stronger after rain. Never go alone. Respect the space: no glass, no loud music, and no soap or shampoo in the water. The resorts have rules too: most don’t allow outside food or drinks, and some have dress codes. Check the resort’s policy before you go.

Closing and Your Next Step

Whichever you choose, you’ll leave with warm memories. The hot springs of Arenal are a gift from the volcano, and both options let you receive it in your own way. For your next step: decide based on your mood and budget, then pack your swimsuit and water shoes. If you’re still unsure, try both on different days. The river is free, and a day pass is a splurge you won’t regret.