The Calming Potion is what you need to rescue Professor Hammerhead and a young boy who have been trapped on an island in Booga Bay which is your mission in this Island. This will calm the Booga so you can sneak out Professor Hammerhead and the young boy. You need give the Medicine Man three ingredients for him to make a calming potion for you, these are the Carbonated Coconut Milk, Old Bone and the Key Ingredient.
Getting the Calming Potion
Once you have all the three ingredients, go back to Medicine Man, who is on the highest coconut tree in Ancient Ruins. You will need to use the stone to climb on the vines. Watch out for the falling coconut!