Arenal Observatory Lodge & Trails it’s the only hotel located in the Arenal Volcano National Park and it gives you unparalleled access to this extraordinary ecosystem. There are 870 acres on this property to explore, including 270 acres of natural primary rainforest with rivers and waterfalls, 400 acres of reforested land and tropical gardens, and 200 acres of pastureland. The gardens and landscaping are extravagantly designed with colorful flowering plants, shrubs, and trees chosen to attract wildlife, like jewel-toned hummingbirds, butterflies, and exotic birds.