There is a lever in one of the two snake pit rooms that needs to be pulled. I had no trouble getting through that tunnel, although there are a few other places that I found incredibly difficult to get through, sometimes taking many tries. Since reloading takes an eternity, retrying really hurts game enjoyment. I wish they woudn't make it so tricky to maneuver, there are better ways to add challenges.
There is only one item you can't get without the serpent idol; a book. You can search this forum for the contents of the book (I posted it in reply to someone else a few days ago).
Good luck.
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