It details a number of interesting things to do as an alternative to the main tourist attractions.
The information sheet includes regular sightseeing activities such as war memorials, lakes and temples, as well as visiting a local mulberry farm.
Another sheet is called Explore the Hidden Stories of Plain of Jars and features activities further afield. It's hard to find detailed information on this stuff without actually visiting the sites yourself on a motorbike or minivan rental, but sites such as Muang Khoun and the town formerly known as Muang Sui are well worth the effort.
The sheets are free from the Tourism Office, located a 10,000 kip tuk tuk ride away in the southwest of town on the way to the airport and jars site one. It is supposed to open daily 08:00 till 11:30, with a break for lunch, and then 13:30 till 16:00, but we had to visit multiple times to find it open.
Still, there is much more to Phonsavan than just the Plain of Jars and these modest brochures are extremely useful in your quest to do more while in town.