Have a look around. Below is an image of the book (click on it if you need one). The Google map next to it is the on-line screen for parks in the City's 6th Ward. Clicking on that will lead you to an example of this robust digital compliment to The Treasure Hunter's Guide. I recommend exploring this web site to see all of its ever growing content.
This indicates the St. Paul parks that I've researched. More to come.
Just in case you have clues that reference the districts in the City, here they are: