Are you looking for Western or English lessons? There is a small farm close to my house in NRH and they had been advertising lessons a while back. I'm not sure if they still are. However, I've seen one or two young adults out there having lessons and they were riding Western, so I'm not sure if this farm teaches English riding. I can try to get a number for you if they still have the sign up for lessons and this interests you.
One thing I can tell you for sure, is that their horses are beautifully healthy. They have pastures where the fence runs up by the road and we can easily see the horses. They are in great condition. I'm a huge horse lover, and the health of the horses is the first indication for me as to how an operation is run.
***Updated 12/19*** Thanks Darla for telling us that the place on Rumfield is no longer giving lessons. That is the place I was talking about. I knew I hadn't seen the sign out anymore but I wasn't for sure if they'd stopped for good or just during the colder months. :)