Barra Honda National Park contains 2,295-hectares (5,600-acres) and protects an underground system of more than 40 caves. Nineteen of Barra Honda's caves have been explored. Pre-Columbian remains have been found in several of the caves.

The caves reach as deep as 200m (660 ft). This cave is intact and not very commercial. As a result the Barra Honda's speleothems — stalagmites and stalactites — are not broken and are stunning.

There is a cave at Barra Honda with regular access to the public and is 62m (205 ft) deep. To explore other caves, travelers are required to hire a guide. Guides are members of an association and their services can be obtained through the national park offices in Nicoya. Travelers descend via ropes and ladders.

The Barra Honda caves are only open during dry season.

Some of the underground wildlife at Barra Honda includes:

• bats
• fish
• albino salamanders
• a variety of invertebrates

Wildlife found on the surface includes:

• howler and white-faced monkeys
• coatis
• deer
• skunks
• anteaters
• armadillos

The hills of Barra Honda National Park have several trails for hiking. Maps are available at the Barra Honda ranger station.