Pick up the full story at the NPS HQ in Cruz Bay and take it with you before hiking through these ruins.
It's an easy walk from the parking lot below--wear bug spray.
This was the largest sugar plantation on St John and is well preserved, enough so that you get the picture on how everything worked.
Picnic tables under shade near the windmill, great views of Leinster Bay as well as the BVIs: Great Thatch and Tortola.
Recommend you go on your own, as the taxi tour driver gives you very little time to explore, learn, enjoy the ruins. At our leisure (about an hour), we read all everything, imagined a lot, could almost smell the molasses, and see the struggle of the slaves making this work. Then we hiked to Leinster Bay and snorkeled Waterlemon Cay.
You can catch the NPS providing living demonstrations there as well--they will make dumb bread and talk about how it all worked.