Welcome to the Island
As soon as you land, you can avoid the vendor with shark fins, it is unimportant. But, you should talk to the second vendor, with the carbonated coconut milk. Go right to the Ancient Ruins. Once you're there, a girl says she got a part of Professor Hammerhead's journal, but it got blown onto the roof. Go to the right and use the big cube to get on the vines. *Watch for falling coconuts* Once you're high enough, jump onto the ruins. Pick up the page, don't give it back to the girl... it's your's now >:D
Short Delay
I would suggest going right to Booga Bay and grabbing a leaf skirt from the third and final vendor. You can do this later, but I suggest to just get it out of the way as soon as possible. There is a woman crying there, because she lost her son.
Temple
Go back to the temple, and enter the dreaded ruins. Once there, just drop into the water, then cross into the right section. Watch for the bat, he will hurt and stop your progress. in the right section, an explorer says 'You have to decipher the code' to get in the door. Luckily for you, you have a deciphering page. Go to the door, and simply type in 'Open'. Press the upper triangle, and it opens. When in there, a strange man thinks he is a bat... he's not one of the weirdest people in this game though, I must say. He says ' My sonar senses tell me there are bones of a great beast near'. In the left, there is a centipede that you must avoid by timing right. Once up, go in the lower left... batman was right. (Of course he was, he is Batman after all...). Grab the bone in his moth and go back right and get on the swinging platform over the centipede. Jump left and cross the spiky abyss. Pass the hieroglyphics and pick up the secret ingredient. Escape upwards.
Mixing
Go to the ruins, climb up the vines and find the man with the blue islander's mask. He says he only mixes for natives. No problem, you have a grass skirt. Put it on and He will take the milk, bone, and key ingredient and make a potion coconut.
Finishin' Up
Go all the way to the right. You can try to swim through, but a shark stops you every time. Go to the place where you can feed the shark. Launch a coconut (it will have the potion on it) and it puts the shark to sleep. Cross over where there is a man giving SOS symbols. He will thank you and a boy comes in, he tells you to lead the way back, which you do, and the reward comes. The old man gives you the reward and the kid was actually the one the woman lost! Everyone's happy.
Fun Extras
There are none on this island :T Whadaya gonn' do?
My Challenge of the Island
Try to break all of the medicine man's glasses on his tree- don't push them off the tree! To break, only push it off the platform onto another.