Ends up we had just landed on the marked off "road" to a movie set! The kid was the security guard and they were to start filming in the next couple of days. The path to drive on was marked off to limit the number of tracks on the lakebed. You see, in the movie, this was to be the surface of an alien planet. They had one big green screen "tub" set up as well as another container/structure on the east side of the island. See the pics below.
The markd runway/roadway.

The green screen tub in the distance. The containers were behind the plane.

Structure on the east side of the island. I forget what he said it was to be.

Well, ends up the movie, "John Carter", premiers in on March 9th. Looks like it could be pretty good.
