There are written solutions below at the Related Questions.
There is a video walkthrough at the Related Link.
There is no Diamond Island on Poptropica. There is a Diamond Mine on Nabooti Island. (see related question)
(*The question is not how to "get past" Giza, but rather how to beat it. See the related question.)
The island sponsored by "Choose Your Own Adventure" books was Nabooti Island. (see the related solution question below)
See the related questions below.(On Nabooti Island, what are missing from the totem are "jewels".)
The tomb is inside the Sphinx at Giza, on Nabooti Island. (see related question)
There is no oil can on Nabooti Island. For the Diamond Mine, see the related question below.
There are animals on many Poptropica islands. There is a Safari on Nabooti Island, cryptids on Cryptids Island, and in several quests. See the related questions.
Animal pictures are taken at the SAFARI on Nabooti Island. (see related questions)
On Nabooti Island, your challenge is to locate the 5 missing Nabooti Jewels that were taken from the Nabooti totem, which is in the Island Museum. When you have located and recovered the five jewels, return them to the totem. Get the map of the island from the totem guide at the Museum. (see related question)
Recover all five missing Nabooti jewels, and return them to their proper positions on the Nabooti totem. From top to bottom : Purple, Green, Red, White, Blue (other two are there already) (see related question)
It is the final challenge in the tomb under the Sphinx on Nabooti island. (for the solution, see the related question)
Push them off the shelf to either side and match them to the painting on the wall below. (see related question)