I had the family there the other year and they tried to ride the double track, but it wasn't well maintained and it was mucky for them. We should have stuck to the single track.
Yes! It's kind of weird that they have these lovely trail maps showing doubletrack trails which you would expect to be well-marked and maintained but aren't. I get the sense that they are used more in the winter by snowmobilers than they are by bikers.