The Idol
If you have come to this page, you are here for additional information.  I do not know how much info you want, so I will do this in steps.  When you have gotten what you need, just stop reading.  If you continue on, this page becomes a spoiler.  It is up to you how far you read.  If you do not want a spoiler, stop when you have enough clues to continue on your own!!
The idol on Jungle Island is there for more than just looks.
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The Clues
There are two different maglev transport rides to Jungle Island.
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One maglev comes from Temple ("Arrival" ) Island.  The other comes from Spike Island.
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There is also a walkway on land which will get you to the idol.
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CAUTION!!  Spoilers After This Point!!
There is an elevator inside the idol.  There are two ways to get into it.
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There are three, not two, levels you can reach from the idol elevator.
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When you approach the idol from the front walkway, there is a footbridge.  At the end of the bridge are two round things on posts.  One of them does something.  Click on it.
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Once inside, you will be on the elevator.  If you came in through the walkway, you will be at the mid-level position of the idol elevator.
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If you came in on the maglev from Spike Island, you will be at the lower position.