You will need to complete the Port Dover Adventure Lab and collect the hints at each lab to form 3 words to place into the checker. You will be looking for a bison tube hanging in a Pine tree. There is a small climb to be made to reach the container but a very easy one. Container is visible from the ground. I hope you enjoy the Lab and your visit to Port Dover. When you enter them type in as all one word. Follow the link below to get to the adventure lab.
https://labs.geocaching.com/goto/7501bd87-0de0-4e5e-928d-6b042491d8c1
You can validate your puzzle solution with certitude.