In just 16 km² fit white-sand beaches, crystal-clear water and a jungle teeming with life. In Manuel Antonio you stroll along short trails and, effortlessly, spot sloths hanging overhead, white-faced monkeys stealing snacks, toucans and coatis. You end the day sprawled on Espadilla Sur, one of the loveliest beaches on the Pacific. Costa Rica's most visited park, and it's easy to see why.