You will need to visit four locations to find the final location. At each of the first four locations you will find a clue that will give you a portion of the coordinates to the final location.
The final location (Attack of the Peanut Butter Jars: Finale) will be at the following location:
N 46° 54.XXX
W 96° 47.XXX
It should be common sense, but based on the wet logs you find from cache to cache maybe it should be stated: make sure the cover is screwed on tightly and the Ziploc bag containing the logbook is sealed after each visit.
Email me if you need any help and good luck!
Attack of the Peanut Butter Jars: Fox Run
Attack of the Peanut Butter Jars: Stonebridge #2
Attack of the Peanut Butter Jars: Unicorn
Attack of the Peanut Butter Jars: Finale