The vendor is giving out free samples near the beginning of the island, on Main Street.
The vendor that sells coconut milk is on Shark Tooth Island, next to the huge coconut shop. You can't drink it, though.
Mask? What mask? There is no mask that you have to find in Shark Tooth Island, Poptropica.
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.
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 have to go inside the temple and get to the other side. after each obstical you find an ingredient. you also need the coconut milk.
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 the medicine man mix a sleeping potion, using coconut milk, a creature bone, and a key ingredient. The bone and green ingredient are down in the underground ruins. Once you have it mixed, you fire it from the shark feeding Coconut Cannon at Booga bay. (see related questions)
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
In the Temple
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you can find milk at the coconut stand in shark island