There are four ranger stations in Corcovado National Park that you can choose from to visit. Los Patos, Leona, San Pedrillo and Sirena. From these stations you can do day trip hikes, with the trail from San Pedrillo and Sirena being the most popular. But if you have the time and you literally want to dive deep into the wild jungle of Costa Rica, you can choose for the 14 kilometer (8.6 mile) overnight hike from Leona to Sirena. By doing this Costa Rica trekking tour thought the dense jungle, you have more chance of spotting endangered species such as jaguars, pumas, red-backed squirrel monkeys, anteaters, wild pigs and tapirs.