A humongous collection of woodlands and parks (2,800 acres!), the Greenbelt is a collection of nature you wouldn't expect to see in any major city, let alone New York. The Greenbelt covers much of the Mid-Island, so it's best to know which part you want to go to beforehand. A good place to start is the Greenbelt Nature Center an educational facility in the center of the park. The park is a great place for hikers, and a map of hiking trails can be found here