Do's for the United Arab Emirates

Ask permission before photographing anyone.
And how is this negotiated? How do you approach a person, what do you say? Esp. if you don't really speak Arabic
Avoid photographing Muslim women, government and military buildings and personnel.
Seems wise, I wonder what countries this would not be highly recommended behavior for these days.
Bargain while shopping especially when using cash.
Get a script. How do you start? How far do you vary? Do you smile, do you raise your voice, do you threaten to leave, end with falling intonation?
Decline twice when offered a refreshment.
This is nice and concrete. How do you politely refuse? Is there a danger of accidentally communicating that you really do Not want whatever is being offered? How would you investigate this aspect of a culture?
Tip supermarket baggers, bag carriers, and windshield washers at petrol stations.
Script? How do you know how much to give to whom? How do you make this transfer of cash? I can imagine many ways of giving money to a person that might be funny or offensive or stupid. . . what does this look like? Do women and men both tip both women and men?
Dress modestly. Women should cover tops of arms and their legs.
Nice concrete guideline, but but how much of their legs? Ankles? Feet? Knees? What constitutes covering-lace, light diaphanous linen, solid black totally opaque fabric?
Have clean feet and wear respectable socks.
good, but what is respectable? I assume no holes, but what about my lady bug socks with a pom pom at the heel? Are those respectable? Argyle? White socks with a dark suit? Toe socks? That's not as ridiculous as it sounds, construction workers in Japan wear socks that have the big toe separated for a kind of construction shoes almost flip flops. I know it sounds oxymoronic, but if you have to keep going in and out doors, and you have to take your shoes on and off. . .