Option A- Okay, then come mow my lawn. Its massive--about one acre. As a matter of fact, most of us need someone to help mow. You could make the rounds and we could pay you in old bottles, etc.
Option B- Use your Uncle's cutter and gas and just do the back 40 acres. Break it down in halves. You could do 20 acres one day and get the next 20 acres another following day. Your Uncle will be impressed and maybe you'll find a trash pit while you're out there!