Kapaa vacation homes and Wailua vacation rentals can be found on this map through the ID numbers or via the green condo complex and communities links. Visit Wailua River State Park, Fern Grotto, Wailua Falls or Opaekaa Falls, the Coconut Marketplace or one of the many beautiful beaches. Fed by 40 feet of rain annually, the Wailua River snakes through Kauai's east side to the spectacular Wailua Falls. A popular river trip is to Fern Grotto. The Grotto is a huge rock amphitheater, whose ever misty walls create the perfect conditions for ferns to grow. The ferns fill the cavern with their deep musty smell and penetrating green beauty. This natural cathedral has wonderful acoustics and is a popular location for weddings.