Time in Nature in Costa Rica Found: 2 | Change Filter Options Rio Sierpe Mangrove Tour Explore the Rio Sierpe mangroves in Costa Rica and discover its wildlife with Osa Rural Tours Cooperative. 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.