Deep in the heart of Arenal Volcano National Park, the super-luxe Nayara Springs is reached by a bridge across a jungle ravine from sister hotel, the Nayara Resort. Welcoming adults only, this boutique sanctuary of 35 villas is surrounded by tropical gardens and populated with myriad, colourful birds. Expansive villas - hidden deep in the verdant vegetation - have four-poster beds, outdoor rain showers, and gorgeous infinity pools fed by thermal water. Begin the day with an espresso from Mi Cafecito before a bird-watching tour or sunrise yoga class.