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. This snapshot explains how to use the mapped imagery in the OnlineTreasureHuntersGuide. I recommend maximizing the view when viewing the mapped images.
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: