The Arenal Volcano rises 1657 meters above sea level and overlooks Lake Arenal; both are part of Arenal Volcano National Park. The country's most active volcano, Arenal's eruptions are strombolian in type, being frequent but moderate and can be viewed without danger as long as the viewers are behind the safety perimeter. This constant activity and minimal endangerment makes Arenal a popular tourist destination, especially at night because the lava and incandescent rocks make a spectacular sight. The last major eruption of Arenal occurred on August 23, 2000. Most of the time, the volcano is surrounded by clouds near the tip, and it is touted as good luck to see the whole volcano without clouds. The volcano heats a number of hot springs nearby, which are popular tourist destinations.
Courtesy of Wikipedia