You cannot get over it until you have been to the pleasure palace. So keep playing the game, and come back to it after you have unlocked all 4 islands etc.
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You find it on crystal beach
crystal island. Swim to it from the first island after you have done the cerimonial cliff dive
find all the necessary items. to make glass fine sand is on crystal island (swim to it from the first island)
All you need to do is collect fine sand on crystal island..once you've collected fine sand you have to go to interior temple and there's a crafting machine there,where you can make a glass..hope this will help..:)
crystal island is pretty much just recourses. you need to go there to get fine sand which you will need to make glass. If you go to shelters there is a bungalow that needs glass.