Credit: Andrew_Mayovskyy / Getty Images The world's greenest places encompass a variety of ecosystems and habitats, from the mossy Hoh Rain Forest in Washington State to the subtropical Sapa Valley in northern Vietnam.If you're hoping to pair your green getaway with wildlife sightings, plan a trip to Costa Rica's biodiverse Corcovado National Park or the Congo Basin in Africa.You can also book accommodations that highlight the natural surroundings, such as Copal Tree Lodge in Belize's Maya Mountains. There's a reason green getaways leave us tranquil and refreshed. According to color psychology, this soothing shade helps decrease stress and improve focus—and travelers can reap these much-deserved benefits in lush landscapes around the world. Here are 10 of the greenest places on earth, which combine serenity with unforgettable adventures. Sapa Valley, Vietnam Khanh Bui / Getty Images Nestled in Vietnam's northern mountains, Sapa dazzles with emerald rice paddies dotted across undulating green hills.…