The Arenal Volcano National Park is undoubtedly one of the best place to visit for your vacation in Costa Rica. The famous destination is a hit to the visitors simply because of its stunning beauty and unspoiled nature.
Watching the lava flow out of the volcano's mouth every night, seeing it glow amidst the dark background is definitely a chance you should never miss.
You should stay long enough to see some eruptions at night if possible. During the day if you hike in one of the nearby areas you might hear the volcano growling, kinda like a huge cast iron stove with indestigation.
Link: Costa Rica UnCovered