If your pals are adrenaline junkies, there may be no better place on earth to get your heart thumping than the outdoor playground that is Costa Rica. From otherworldly hikes in cloud forests to riding the waves in Tamarindo to sky-high zip-lining, this Central American country is perfect for an adventurous girls trip. But at the end of the day, you can still relax in style: Snag a reservation at the adults-only Hotel Three Sixty. The 12-villa property is ideal for large groups and we love its secluded location inside a 58-acre rainforest reserve.