It translates the ancient symbols into English, so that when you get to the locked door in the underground ruins, you can type in the word "OPEN". (The symbols are the 3rd, 4th, 6th, and 7th from the left. Pushing the nose opens the door.)
There is no journal on Nabooti Island. But there is a ripped part of a journal that you need to find on Shark Tooth island.
No, it's just decorative.
Take the blimp to the island. Get the coconut milk from the guy on Main Street and continue right to the Shark Museum, where you can read the journal of Professor Hammerhead. His missing journal page is on top of the ruins farther right. Entering the ruins, you can collect the ingredients for a sleeping potion. You need it to get past the shark on Booga Bay (far right of the island).
In the underground ruins on shark tooth island, you need a code to open the stone door. It is the word "open" in the hieroglyphics from Hammerhead's journal. The journal page is on top of the ruins, and you can get it by climbing the vine to the first platform, then jumping left. The word "open" is spelled by pressing the 3rd, 4th, 6th, and 7th symbols from the left, and then pressing the nose.
you need the resting carbonate to make him fall to sleep
There is no honey on Shark Tooth Island. The three ingredients you need are coconut milk, a creature bone, and the green Key Ingredient. (see related question)
To get the comic book in shark tooth island, you need to go to the comic book store and talk to the nerd. Ask him those questions and he will give you the book.
The missing page is on top of the ruins, and shows the translation you need to OPEN the door in the ruins. (Push the rock over to reach the vines, climb and jump to the roof.)
You don't, it's just a decoration. You can also get the whole "shark outfit" by copying it from Shark Boy in the museum.
you need to get the page of hammer heads journal to decipher the code the symbols need to spell OPEN
A coconut bone and secret ingredient
There is this man on this building that makes coconut medicines and you need a medicine that will put him to sleep