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There is only 1 Treasure Chest at Cozumel. It's close to the structure you came to after climbing the bells.
Treasure Chest Walkthrough
In the area, after you climbed the bells, there is a Tether point for a rope line to get to the other end (this is the story path). Use it and use the rope line to get to the other side.
At the other side, look back to where you came from. There is another Tethering point on the other side. One above the one you just used. Shoot an arrow to the one above to get a rope line to the top. Use it and go across.
The Treasure chest is at the other side of the room and requires the Lockpick to open.