Palo Verde National Park protects a portion of what is called the Río Tempisque lowlands, an amazingly diverse patchwork of habitats, including freshwater and saltwater marshes, deciduous, riparian and evergreen forests. The marshes are an extremely important stopover point for migratory animals and in January and February the largest concentration of wading birds in Central America can be found here.

The Catalina sector of the park, in the northeast area, contains interesting primary forest, but no trails per se. It's common to see animals like pizotes, querques, collared peccaries, coatis, white tailed deer, spotted skunks, white-face monkeys, iguanas  and many more.

Map of Costa Rica and its National Parks