The Royal Corin is tucked among the dense rainforest at the foot of the Arenal Volcano. Rooms, which have a terrace or a balcony, come with a view of the peak or hot spring pools. You’ll want to head to the volcanic steam sauna, which has cracks in the floor so you can hear and smell the boiling spring below. Need more? The Eco Termales hot springs are just a 10-minute walk away.