The biggest highlight of the trip for me was seeing a night view of the Arenal volcano erupting. This volcano has been continuously active since 1968, when a major eruption killed 78 people.
Small eruptions occur every few minutes, with larger eruptions ocurring occasionally.
These larger eruptions send lava and ash into the air, which is truly spectacular at night. Another volcano that we visited was Poas. This volcano contains two crater lakes and is mildly active. On the day we visited, we were unable to view the craters, due to heavy fog.