Colburn Park on Green Bay's west side is located close to Lambeau Field. I used to live in the neighborhood and walked over frequently or biked over and through the park's paved trail. We still occasionally stop to use the playground, tennis courts, or ice skate. You used to be able to sled here and my kids tried out snowshoes for the first time here. There's even a pool.
Colburn park has two main entry points and either one will easily bring you to this cache (the Fisk street entrance *might* be a little closer but I'm not sure). Enjoy! Please make sure to close the lid tightly and make some effort to conceal the container for the next person and to keep it from being spotted by passers by. Thanks!