I wasn't sure about the second pic, too, so I watched the DVD..
That pic is from their trip that is shown immediately after the thanksgiving scenes.



I'm quite surprised that it's the same route (or part of it) like they had in their '63 summer, cause -liked kathy said- I always thought that they had never come back to Brokeback Mountain again..
Perhaps it isn't Brokeback itself, just in that area around..