Four kilometers south of Venado (Spanish for ‘deer’) along a good dirt road, the caves are an adventurous excursion into an eight-chamber limestone labyrinth that extends for almost 3km. A bilingual guide leads small groups on two-hour tours through the darkness, squeezing through narrow passes, pointing out the most interesting rock formations and encountering bats and bugs. You’ll be provided with rubber boots, headlamps and helmets, as well as a shower afterwards. You’ll definitely want to bring a change of clothes.

Any tour operator in La Fortuna can arrange this trip for you. If you’re driving yourself, the caves are well signed from Hwy 4. Otherwise, Cabinas Los Almendros offers transportation from San Rafael de Guatuso.