Tom Sawyer's Island did not open in 1955...it wasn't ready for guests until roughly a year later. When this photo was taken, the island had been open for two months. Sorry about the crazy color, this was one of those slides that had turned a deep magenta!
Folks riding the Mark Twain now had something fun to look at, as guests explored the caves and peaks, the treehouse, barrel bridge and suspension bridge. And the fort, of course.