Birders flock to the Cook Islands for a chance to spot the colorful Kakerori, an endangered species found only on Rarotonga. Pack the binocs for a nature trek or 4X4 safari into the island’s lush, jungle-covered interior when Holland America Line cruises to this Polynesian paradise. You can explore sacred marae and other ruins left behind by an ancient Rarotonga hill tribe, and hand-feed reef fish right off coral-fringed Aroa Beach — renowned for some of the Cook Islands’ best snorkeling.
