Getting there & away
The main road to the entrance, usually passable to ordinary cars year-round, begins from a signed turnoff from the Interamericana, opposite Bagaces. The 28km gravel road has tiny brown signs that usually direct you when the road forks, but if in doubt, take the fork that looks more used. Another 8km brings you to the limestone hill, Cerro Guayacán (and the Hacienda Palo Verde Research Station), from which there are great views; a couple of kilometers further are the Palo Verde park headquarters and ranger station. You can drive through a swampy maze of roads to the Reserva Biológica Lomas de Barbudal without returning to the Interamericana.
Buses connecting Cañas and Liberia can drop you at the ACT office, opposite the turnoff to the park. If you call the ACT office in advance, rangers may be able to pick you up in Bagaces. If you’re staying at the Hacienda Palo Verde Research Station, the staff can also arrange to pick you up in Bagaces.