List of Gallery Walkthroughs: Island Gallery Walkthroughs
Go right to the Ancient Ruins and push the square block all the way to the tree on the right. And watch out for falling coconuts!
Use it to launch yourself onto the temple's roof and get the Translation Key. Go into the Temple Entrance, hop through the swinging platforms, and land on the left where there's a green keypad on the wall.
Enter the code "OPEN" according to the Translation Key. Go left to the Temple Dungeon.
Climb the statue, hop onto the swinging platform, jump on the two platforms to the left, and jump down. Walk left and get the Old Bone. Go left to the next area, the Temple Treasure Room. Run left and grab the Key Ingredient. Exit the temple. Push the square block to the tree and climb up until you reach the top of it.
Go back to Booga Bay and run right to the cannon.
Click the cannon and launch the Calming Potion, which the shark will consume. Now go to the right, past the now-sleeping shark, and arrive on Castaway Island. Talk to the man and the boy, and they will follow you. Bring them back to the woman on Booga Bay.
Professor Hammerhead will give you the Island Medallion. Congratulations, quest complete!