Birdwatching in The Osa Peninsula Found: 2 | Change Filter Options Corcovado Hike 'El Tigre' Discover the El Tigre Trail, a 7km hike in Corcovado National Park, showcasing rich rainforest, wildlife, and indigenous history. Rio Sierpe Mangrove Tour Explore the Rio Sierpe mangroves in Costa Rica and discover its wildlife with Osa Rural Tours Cooperative.