The ability to navigate would be crucial. This scenario isn't really a question about kit (what you would take and leave behind) but about experience in suffering a little without giving up on the unplanned trek.
The scenario sounds pretty tough for even the folks from the US Army Mountain division. For others it would be a fun outing.

The ability to navigate is not as crucial as it would seem. Remember these people drove in (small truck actually) and to me it would be prudent to walk out the way you came in via road in one direction or in the other direction over the pass along a forestry road that would be easier and safer then going cross country.
As for the scenario being tough. In reality, it is not a walk in the park but is doable (albeit slowly) by most people who are generally in fair to average shape.
The road (option #2) along the pass. The road in the other direction of option #1 is about the same condition and much better as it nears the town the road eventually leads to.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock