M.P.
I just went to the Roloff Farms (twice) near Hillsboro. It has pony rides ($5) and a great petting zoo along with pumpkins, little corn maze and a pumpkin house that my son LOVED! You can get outta there for $10 if you skip the $6/person hayride. My only complaint was that they don't have good food. Anyway, we had a great time and just packed out lunch the second time.
Also, they are all listed in Metro Parent this week.
Have a great time where ever you end up going. :)
M.