No YOKOZUNA; grand champion sumo wrestler

Just look at this notice carefuly.
It says that; A fire station has warned due that in order to the fire prevention in public facilities, you should never smoke in a lavatory. Thanks for your cooperation by not smoking here. No sumoking.

Sumo-King?
Yokozuna can't use this restroom. Because of his huge size, perhaps? (^^;)

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"says" agrees with present-tense more than "said"

"In order to" sounds natural in this sentence. "Due" implies the fire prevention already happened.

"You should" sounds the most natural in this sentence.

"Non-smoking" is an adjective. "Not smoking" is a verb.

"Perhaps" is used in order to show the question is a rhetorical question.

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Very good entry, nice job!