The second image is of the newly opened Columbia ship docked at Fowler's Harbor. In the background is the striped circus tent of Holidayland. Almost an incongrous site as you cruised around the Rivers of America looking at western landscape and then suddenly a circus tent. I believe the image is taken from the deck of the Mark Twain.
The third image is of the Mark Twain taken from Tom Sawyer's treehouse on the island. This is a very nicely framed shot with the leaves in the foreground adding a dimension to the image.
The final shot is of the arch rock in the Rainbow Caverns area. One detail I had not noticed before are the Southwest Pueblos up on the mesa rocks.