Matt, McSneek is right, DHALO section of the Quittie may be a good option. Not secluded but the first phase of 2 phase stream improvement was completed early this year to provide better holding areas and movement for fish. Also had a stocking in early October. Very easy to get to from Hershey. Manada Creek DHALO is another possibility. It is one of my favorite places as not many others fishing there and some sections have decent number of fish. However, the last time I was there (about a month ago) water was very low and rain has not been good. Clark I absolutely love because of its beauty and seclusion. I usually fish above Dehart Reservoir but when I was last there water was very low also. Another thing, in that area (and much of Clark) the creek runs through State Game Land and I believe we are in archery season so caution and orange should be the norm. The FFO section was to have gotten a stocking in early October. I have never fished that far downstream but I have heard it is nice and good fishing after a stocking but, of course, more fishermen. Water levels may be better down there as it is below the dam and they may control flows. I don't know.
Hope some of this helps.