We were able to see the sun come up due to being awakened suddenly by an eruption. Arenal is the perfect coloration for a sun rise. It's light brown tone picks up the color of the sky beautifully. For a moment it was a soft pink color and then switched to a vibrant orange. It erupted again at 6:30 am, and from around 9am until we left, it erupted about every hour with small puffs of smoke and low thundering sounds. We took in our last moments of serenity, tranquility, and luxury at the Hotel Arenal Manoa before being picked up from our journey back to San Jose.