One of Costa Rica's lesser-known eco-destinations has been developing a growing selection of nature-themed activities in recent years. In the 19th century, Puerto Viejo de Sarapiquí was a thriving river port and the only link with the coastal lands straight east. Fortunes nose-dived with the construction of a full-fledged port in the town of Moín near Limón, and today Puerto Viejo has a slightly run-down air. The activities of the Nicaraguan Contras made this a danger zone in the 1980s, but now that the political situation has improved, boats once again ply the old route up the Sarapiquí River to the San Juan River on the Nicaraguan frontier, from where you can travel downstream to Barra del Colorado or Tortuguero. (Wars of words still occasionally flare up between Costa Rica and Nicaragua, but they need not concern you as a visitor.) A few tour companies have Sarapiquí River tours with up to Class III rapids in the section between Chilamate and La Virgen, with plenty of wildlife to see. If you prefer to leave the driving to them, many of the lodges operate boat tours on the tamer sections of the river.
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