On many days, visitors can see the rock slides down down the side of the volcano, even from a distance as far away as the vantage point from where I took the second photo. Most days, there are clouds covering up the top of the volcano. The top photo shows Arenal on a clear day. The second photo shows a cloudy day.
At night, if it is clear, the eruptions of red lava are visible, sometimes looking like fireworks shooting into the air. During the next few days I will show some more photos of Arenal on clear days, including a night shot of lava flowing down the mountain.