There are two sections to the Blue Nile Falls. The one on the left has the woman and her animals trying to cross. The other section is far to the right and has a large rock about halfway down. The bush is on that rock. The only way to reach the cave behind it is to get the woman across the falls with her animals. Once you have done this, the "blue hand" will appear when you point to the cave.
in a bush
There are TWO caves on Nabooti Island. One is hidden behind a bush at the Blue Nile Falls, and the other is at the top of the Mountains of the Moon. (see related questions)
the man tells you that there is a hidden cave behind a bush to the right
She directs you to a cave on the right side, which is partly hidden by a bush. Inside you can find the Purple Jewel.
The hidden cave at Blue Nile Falls is behind a bush on the far right. You have to beat the puzzle of crossing the falls with the animals before you can enter the cave. The Purple Jewel is inside. (see related question)
The Kaya Forests are a location on the island, one of the spots to find a hidden Nabooti jewel.
The Nabooti totem, in the museum on Nabooti Island. Five of the seven jewels were removed and are hidden in areas of the island. You have to recover the jewels and put them back on the totem to beat the island.
Go to the waterfall place and then go to the far right, jump up a few rocks on the right side that are in the waterfall and on 1 of the rocks you'll see a bush. Click on it and then you opened the cave.
"Hidden cameras" are not a noted feature except on Spy Island, where there are several. On Nabooti Island, you can buy a digital camera for use on the safari. (Find a gold nugget in the palm at Kaya Forests and buy the camera at Nabooti.)
You have to first help the ladie by helping her put the things to the other side by putting the feed and the chicken but bring the chicken back and get the wolf then get the chicken the woman will tell you the cave is behind that platform with the bush.
Go to the right and look up, there should be lots of rocks and a river. Then on one of the rock parts, there is a bush, that bush is where you click, then your in the cave.
No, it just makes you look like the spirit in the Kaya Forests. The mask was hidden on Spy Island for a short time before Nabooti Island was actually released in 2008.