Hiked it many times do you want and actual route ? The route has changed slightly due to construction 🚧 on the South Side
Route: Nassau-Suffolk Greenbelt Trail (NY)
The 19.5-mile Nassau-Suffolk Greenbelt Trail on Long Island, completed in 1986 and granted National Recreational Trail status in 1992, preserves a narrow corridor of open land in a densely populated area from Cold Spring Harbor to Massapequa. The trail is blazed white.
While this trail does not offer anything remotely resembling a wilderness experience, its incredibly diverse flora and fauna make up for the lack of isolation. Also, its northern end provides a surprising challenge to hikers expecting an easy stroll on flat Long Island. Elevations vary from sea level to over 200 feet in a rapid series of steep morainal hills.