Heavy wooded brush, the back acres have not been touched in decades. Clearing a trail or two and perhaps a food plot.
You'll want a heavy duty brush hog, but you also might need someone to come in with a Fecon head (forestry mulcher).
You could also consider a heavy duty flail on a 3 point hitch, but you'd have to slowly and gingerly back through the heavy woody stuff. Your wear and maintenance will be accelerated.