Blue River and Tenorio Volcano National Park Hike. Hike through Tenorio Volcano National Park's remarkable landscape and see the otherworldly blue of the Rio Celeste waterfall on a full-day trip from La Fortuna. Follow your guide on a 4.3-mile (7-km) trail into the forest, watch for the monkeys and birds as you stroll past a serene lagoon, and take in views of the imposing Tenorio Volcano. Visit the park’s boiling mud pits and brightly colored jungle waterways, then enjoy a full lunch in the park before returning to your hotel. Book with us and Save 15%! Blue River and Tenorio Volcano National Park Hike.