NOT AT THE POSTED COORDINATES!!!
Come take a nice stroll along the Kinnickinnic River, which gives the city it's name! There is nothing impossible about this puzzle; just play the Adventure Lab that we've created until you are done, and then you can collect the letters to enter into the checker below.
You will not need to leave the pavement to complete the adventure lab. You will need to do so to get to the final. The final container is an ammo can.
You can validate your puzzle solution with certitude.