The Sixth Clue:

Now that you’ve met the birds, the geocache is revealed. Near the cabin is where you’ll need to look. Follow the sidewalk towards the cabin and look to the right where a wealth of knowledge awaits. One of these things is not like the others - a little golden chipmunk told me Page 213 is a good place to start.

Remember: None of the clues will require you to enter any buildings or structures.