You use the cannon
The sleeping potion for the shark requires three ingredients (coconut milk, bone, key ingredient). Find them and take them to the medicine man (in the "tree" next to the ruins), who will mix them into a coconut for you to feed to the shark. (see related question)
You have to gather three ingredients and mix them into a sleeping potion. There is a medicine man who will mix them for you, and you can feed it to the shark in a coconut. (see the related question)
Find the three ingredients for a sleeping potion, and have the medicine man mix it and put it in a coconut. Feed it to the shark. (see related question)
You don't eat the coconut, Booga the shark does. You can feed him coconuts with the Coconut Cannon at Booga Bay. You need to find the three ingredients on the island (coconut milk, bone, and key ingredient) and bring them to the medicine man. Once you have a sleeping potion in a coconut, you can feed it to Booga with the cannon.
The medicine man makes you a potion in a coconut. Shoot it at the shark and it will fall asleep. Swim to the island on the right.
When you have collected the three ingredients (and the grass skirt) the Medicine Man will mix them into a coconut for you. Use the giant coconut cannon at the beach, and the shark will swallow the potion and fall asleep.
Fire it in the coconut cannon at Booga Bay. No matter where it lands, he will swallow it, and you have succeeded.
You can't swim to the island while the shark is active. But you can get the ingredients to make a potion that will put him to sleep. Gather the three ingredients (coconut milk, bone, and key ingredient) and take them to the medicine man, who will mix the potion in a coconut to feed the shark. Wear a grass skirt and he will help you. (see related questions)
Someone has built a "coconut cannon" to feed the giant shark. Get the medicine man to mix the three ingredients into a coconut. (see related question)
Well if your asking about Shark Tooth island he is on the island past the coconut launcher. Get all the ingredients for medicine man and give them to him. He will make a potion in a coconut, go the the coconut cannon and shoot the potion coconut in the water and you'll see the shark come and eat it. He will fall asleep and you can cross. There you will find the son and Dr Hammerhed
Once you collect the ingredients for the sleeping potion, the medicine man mixes them into a sleeping potion for the shark. Once he is asleep, swim out to the island in the bay, where you will find the missing boy, and Professor Hammerhead as well. Lead them back to the beach.
Along with the coconut milk and the green Key Ingredient, the bone is used to make a sleeping potion for the giant shark (Booga) that menaces the island. Get a grass skirt from the bay before bringing the ingredients to the medicine man. (see related questions)