Just got back from riding Ella Sharp. We did Driving Range, Probert, Hedgerow and the Museum. I think there were only two spots where we had to dismount. There are a lot of low branches to watch out for though. It was actually in better shape then I was expecting.
We ran into three other guys out there and they said the North section is pretty rough. I guess you can't even ride to far without having to get off the bike to go over something.