the island you start on.
The Mercay Island riddle is a part of the Legend of Zelda game on the Phantom Hourglass version. The riddle requires you to shine a beam between the tavern and the temple.
It's right before the dock on Mercay Island.
It is around the top of Mercay Island.
go to the shipyard next to the deck on mercay island to customize.
to get to the shipyard go to Mercay island and then go in the building closest to the dock
You go to mercay island and go to temple of the ocean king
On molida island Mercay Tavern is the rectangular shop that looks like a bar. If you can't find it look around all the shops until you find one resembling my description.
It is cannon island, just southwest of Mercay isle. but i will warn you it is like a puzzle that is fairly hard to get to eddo the first time.
all you do is point it toward the Temple of the Ocean King's door to open it.
look or the third or go back and search mercay island
Wayfarers cave on Molidia Island