Once thought to be a volcano, 1,184-foot Barra Honda peak actually contains an intricate network of caves, a result of erosion after the ridge emerged from the sea. Some caves on the almost 23-square-km (14-square-mi) park remain unexplored, and they're home to abundant animal life, including bats, birds, blindfish, salamanders, and snails.
Every day from 7 AM to 1 PM local guides take groups 58 feet down to the Terciopelo Cave, which shelters unusual formations shaped (they say) like fried eggs, popcorn, and shark's teeth. You must wear a harness with a rope attached for safety. The tour costs $22, including equipment rental, guide, and entrance fee. Kids under 12 are not allowed to visit this cave but they can visit the kid-size La Cuevita cavern ($14), which also has interesting stalagmites. Both cave visits include interpretive nature hikes.
If caving leaves you feeling claustrophobic, you can climb the 3-km (2-mi) Los Laureles trail (the same trail that leads to the Terciopelo cave) to Barra Honda's summit. From here you have fantastic views sweeping across the islet-filled Gulf of Nicoya. Wildlife includes howler monkeys, skunks, coatis, deer, parakeets, and iguanas. An off-site park office (Across from colonial church, Nicoya. 686-6760) provides information and maps of the park. It's open weekdays 7-4. It's a good idea to hire a local guide from the Asociación de Guias Ecologistas (659-1551). The park has camping facilities; and the guide association runs a simple, inexpensive lodge ($6 per person) near the park entrance. Make reservations for weekend lodging in the park.
Visit the Travel Talk forums for help on planning your trip