Eco Termales Fortuna is a family-run hot spring facility located in San Carlos, very close to the Arenal Volcano. These thermal springs are of a magmatic origin, ranging from 37 to 42 degrees, with naturally balanced quantities of calcium bicarbonates and magnesium, which have analgesic, anti-inflammatory, and muscle relaxing properties. They also offer cool water pools, a waterfall, and a family-style restaurant and terrace bar.