My barn owner and her husband have. Atleast i'm 90% sure they have been. That's the whittingham.
I went on the Paulinskill numerous times. Really nice, flat trail. Lots of oppertunities to go faster. There are a few bridge if you go towards blairstown, but their decently wide. The trails are always nicely groomed and everything.
I did run into a bear once while on the Paulinskill. Bear stopped, looked then continued on his way. Didn't bother us or anything. There's also a brook or river that runs almost parallel. We let the horses cool off/get a drink there one time.
My BO and her good friend have ridden in the brook/river in the summer as a nice treat for the horses.