Sirena Station Overnight Expedition: The ultimate Costa Rican rainforest experience. Travel deep into the heart of Corcovado National Park and experience the "most biologically intense place" on earth. Monkeys, coatis, lizards, sloths - there are just a few of the inhabitants you'll discover as you hike through lush primary and secondary rainforest. As nightfall descends, a whole new cast of creatures awaits - including the elusive jaguar. An early morning hike to spot some 350 species of tropical birds and a boat ride through dolphin and whale filled waters completes this nature adventurers' paradise.