This bustling city is home to extravagant open-air markets that buzz with commerce, fascinating architecture and historical museums. Immersed in palms and vine-consumed Ficus trees is Parque Vargas where sloths can often be seen inching from branch to branch. Enjoy a ride on the aerial tram through the rainforest canopy at Braulio Carillo National Park. Or take a boat ride through the Tortuguero Canals or the Estero Negro Estuary, the rich jungle tapestry all around while watching for colorful birds, monkeys, iguanas, sloths, crocodiles and the legendary iridescent Blue Morpho, the largest butterfly in South America.