Complete ALL 16 Mayan puzzles at the indicated location (see list below) to unlock the secret door in Tulum (coordinates 72, 404) to get the Mayan costume which is able to deflect bullets being shot at you from enemies. You will also unlock the Vault Raider Achievement. After you complete each puzzle look for a green dot on the ground that shows where you can locate a hidden Mayan Stone. Check out the video below if you need help.
Mayan Stelae Puzzle #1: Great Inagua; completed during DNA Sequence 4, Memory 1.
Mayan Stelae Puzzle #2: Cat Island (coordinates 736, 692).
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