don't you dare find an idol Simon
She wasn't cheating. Luke and Simon made a deal to drop together and give her the win. It looks like she might have put her hands up quicker than Luke dropped.
He seems a bit dim, random digging
You look for a landmark/something a clue can be given about, like a forked tree/weird tree,strange rocks/
and always check near the water, and around camp especially in the roof or the flag poles