In chapter 1, how does Golding let the reader know that the island, which the boys believe is a paradise, is a dangerous place in Lord of the Flies?

Golding uses a variety of literary device and plot to
convey the idea that this tropical island is indeed a dangerous
place.

First, Golding's inciting
incident for Piggy is the notion that there are no parents or adults to
supervise the children:

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“This is an island. At least I think it’s an
island. That’s a reef out in the sea. Perhaps there aren’t any grownups
anywhere.”

The thought grows
into reality a few pages later.

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"Didn’t you hear what the pilot said? About the
atom bomb? They’re all
dead."

Ralph had believed his
dad would rescue them, but the reality of the absence of adults is starting to sink in
for Ralph too. Children without the protection of adults is
dangerous.

The boys discover that the island is indeed
uninhabited, but for a few pigs:

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They found a piglet caught in a curtain of
creepers, throwing itself at the elastic traces in all the madness of extreme
terror.

Golding uses
fearful diction to allude to coming danger:
ill-omened, whisper, creepers, crept, and
quivered. Golding uses the setting
(the air grows increasingly hot as the realization of their situation unfolds) to
portray danger.