rails-to-trails are abandoned railroad tracks that have had the rails ripped up, and the remaining roadbed is now open to use for biking, cross-country skiing or walking. The easiest one to access in Sullivan County runs from Woodridge to Mountaindale. There is also a stretch from Libery to South Fallsburg, but that is much more rugged.
There’s also one near Monroe (Goshen, I think) but I’ve never been there.
Is the farm in upstate NY?