A century younger than Yosemite, the world's first national park, Manuel Antonio is one of Costa Rica's smallest national parks. Despite its size, it is also one of the country's most popular national parks, thanks to its dazzling variety of sights: tropical rainforest, beaches and rocky headlands. Wildlife--including sloths, iguanas and squirrel monkeys--is abundant in the rainforest. Sports enthusiasts can indulge in everything from snorkeling and sea kayaking to horseback riding.