If you are looking for solitude during Thanksgiving, let me recommend Great Basin National Park. We used it as a halfway point on our drive from SLC to Bishop, CA.
Stopping in at the local fly or bike shop and asking for advice is a well established ritual, especially if you are in a new area. What river is fishing well? What flies are working? What are the trail conditions?
If you find the last dispersed camping spot in the canyon are you bothered by the dust, noise, and lack of privacy? Or are you grateful that the canyon is beautiful and the camping free?
My previous post on Hams Fork is by far the most popular on this blog so far. I have no data on whether what I wrote was useful, but it made me think about how odd the valley was last time we went, and so we took another trip there last weekend.