Begin your 2-hour tour at the Arenal Natura Ecological Park. Explore outdoor trails through a tropical rain forest as the sun sets. You will see and hear animals that are not visible during the day, like red-eyed tree frogs and walking stick bugs, as they run along the trails and across the water. You may also spot sloths, armadillos, and nocturnal birds. Over 20 species of frogs will be around in their natural habitat. Your professional guide will assist you throughout the tour.