Awesome photos!
Couple things I noticed from this image:
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First, the tunnel openings in the mountain.. playground type area or ride entrance/exits? (look for worker in orange shirt)
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the other thing is this random wall.. it doesn't separate the backstage because both sides will be public areas.. maybe it's to separate where the queue will be for a ride from the general public? If you look closely, you can see what looks like junction boxes along the wall, actual utilities or just theming?
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I have a feeling the wall could be the queue separation because of the ramps towards the right of the photo with the vertical poles which appear to be the beginning of a shade structure:
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