Perhaps there needs to be a "style" for the rugged modern course that doesn't fit into other groupings. We've listed a few, but there are many more that don't look like a park in the style of the classics but also don't fit into any other categories. What about courses that are built on/around lakes/swamps? Carved out of rock? Just built on rugged land with a potentially walkable (not always) but not definitely not core routing? Might have homes on the periphery but wouldn't be overwhelmed with them...
I'm sure how one would classify something like The Honors Course in TN, but its not really a "park" setting the way I think of one. There are lots of these types of courses, some better than others. Off the top of my head...Dallas National, Pete Dye GC, Pikewood National, Longaberger, Cuscowilla, Rock Creek, Gozzer Ranch, Black Rock, Idaho Club, Colorado GC, Victoria National, Tullymore, Hudson National, The Alotian, and The Patriot.
Edit: Blackwolf Run River would be another good example.