Clothing Modesty is key. Swimwear is only for the beach. Shoulders and knees covered at all times – for both sexes – is a good rule to stick to.
Greetings Handshakes (though not firm as that's seen as disrespectful) are normal. Men should refrain from shaking hands with a woman unless she offers her hand first.
Politics and religion Avoid contentious issues such as the UAE's involvement in Yemen and the Qatar blockade. Insulting Islam is against the law, as is publicly expressing sympathy towards Qatar.
Public displays of affection A no-no. Couples should refrain from kissing, cuddling or hand-holding in public. Technically all are public decency offences though most people turn a blind eye to hand-holding.
Ramadan Drinking, eating, smoking, loud music and dancing in public during daylight fasting hours are illegal.
Swearing Considered highly offensive and people have been prosecuted or deported for it.