Time in Nature in Costa Rica Found: 2 | Change Filter Options Explore the Irazu and Turrialba Volcanoes of Cartago Valley Explore the stunning landscapes of Irazu and Turrialba Volcanoes on a guided tour with local experts in Cartago Valley. Rio Sierpe Mangrove Tour Explore the Rio Sierpe mangroves in Costa Rica and discover its wildlife with Osa Rural Tours Cooperative.