I call this a brochure, but it is probably really intended for use as a poster. It folds into eight panels like many brochures, but it is printed only on one side, like a poster.
The poster advertised two 1965 tours to Colorado. One left Chicago on Friday, September 17, arriving Denver the next morning on the Denver Zephyr. From there the tour took a bus to Aspen, where they spent two nights, returning to Denver Monday and Chicago Tuesday morning. The second tour started Friday, October 1, and followed a similar itinerary except spending two nights in Colorado Springs rather than Aspen. For $70 (about $400 today), the tours included coach and bus fares, hotels, and most meals (but apparently not Friday dinner on the train, Sunday lunch, or Tuesday breakfast on the train).