The most known and impressive volcano in Costa Rica, located in the middle of the rainforest, just take a hike and observe the flora and fauna has to offer, or just do the amazing zip lining overlooking the rainforest and end your day submerging yourself in the termal waters heated naturally by the volcano.
(Optional activities are, hanging bridges walk, waterfall rappelling, la fortuna waterfall swimming, Atv’s in the rain forest).