Security in Doha is top-notch, as Qatar is one of the top ten safest countries in the world. There is an extremely low level of crime. Even at night, you don't have to worry about any problems, not only in the city center but also on the outskirts. In order not to disturb the public, Doha visitors should also behave with restraint.
Drinking Alcohol in Public Places
First and foremost is the issue of alcohol. Drinking alcoholic beverages in public places and drunk driving is punishable in Qatar quite severely, up to and including imprisonment.
How to Dress
Local women walk around in closed clothing - visiting tourists do not need to follow these rules but clothing should still be discreet enough.
What's Best Not to Photograph
Be aware that in Qatar you can't take photos of airports, mosques, and military and police facilities. Local reactions to cameras can be very different, so avoid taking photos without their consent.