After arriving at Fort Louis, you can disembark once you reach the small inlet located on the south side of the island. Here, you can talk to the Fara clan, the vicious rivals of the Sea People, as well as other pirates. As soon as you step off your boat, go straight and then turn left at the stone wall. You should see some wooden planks in the sand and be directly in front of a wooden structure. At this location, you'll see a glowing orange light coming out of the sand. Go here and you'll get a prompt to "Dig Up Item," which you can do without needing a separate tool. This is the buried treasure.
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