A bit of a trek but well worth it, Las Nubes is a heavenly retreat among scores of cascades and rapids on the turquoise Río Santo Domingo. Some of the river pools are great swimming spots – it’s M$10 per person to swim here if you’re not staying the night. A swinging bridge straddles a fierce section of water-carved canyon, making an excellent vantage point from which to swoon over the grandest waterfalls. There’s an adrenaline-pumping zip-line (M$50), and you can spelunk and rappel from February through June. A 15-minute hike up to a mirador rewards you with blue-green jungle views.