Costa Rica leads the pack when it comes to preserving the environment, with about a quarter of its land protected by national parks. More than 500,000 species—roughly 4% of Earth's total—live within its borders, from the world's fastest lizard to the rarely seen but always-heard howler monkey. It's also home to Arenal, one of the planet's most beautiful volcanoes, discover the nocturnal natural wonders in a night hike, enjoy crossing the [...]