Cinnamon Bay Loop is an easy 0.5-mile walk, but plan on about an hour if you want to absorb all the information along the way. The trail starts among the ruins of the old sugar factory at Cinnamon Bay [1]. It continues through the woods behind the ruins; markers identify prominent trees, animals, and insects. The hike ends by the ruins of the estate house.
Links:
[1] http://www.moon.com/destinations/virgin-islands/st-john/sights/north-shore/cinnamon-bay