There are, for instance, 850 species of birds. Other tropical life you might encounter in a walk through a forest or jungle are abundant amount of monkeys, maybe an armadillo, sloth, squirrels, anteaters, badger, iguanas, just to mention a few.
Another sight to behold is the eruptions of the Arenal Volcano (Sandy Volcano). That's an unforgettable experience!
In addition there are other volcanoes; some of them with spectacular views of the territories around; and not few have cute lagoons close by.

The cloud forest is also a unique experience for anybody but especially for nature lovers. Monteverde and Poas National Park are outstanding examples of this type of forest. They are magnificent with their vegetation, brooks, cascades and fauna. The beaches are wonderful also.