Your Secret Letter Is... C

Correct! You've located the Fur Seal.

🔎 Clue #4

The boys of my species may be incredibly large, but the girls are often faster and more agile. It takes a lot of strength to haul my big body out of the water so I can nap in the warm, summer air. What am I?

Once you figure out the clue above, venture to that location to find the QR code sign that you need to collect the next secret letter!