Most tourist like to conform to the customs of a place.

The following  just a few of those things for Vienna

Do

• Be careful of pickpockets active in the area of St. Stephen's Cathedral ( Vienna) and on crowded streetcars (trams) and subways ( U-bahn)  Some work in pairs or sometimes in threes. Some organized bands have been known to use children too in their work.
• Stand to the right  on an escalator in the U-bahn or elsewhere. Let those in a hurry go on the left.
• Let those getting off public transport depart before trying to get on.
• Observe seating in public transport designated for the blind, old , sick, pregnant etc. A decal next to these seats which are usually next to the door will identify them.
• Observe "Keep off the Grass" where signs request it.  Keep the place green for the next visitor.
• Buy a ticket for public transport . Whilst it is an honour system, inspections do occur. Inspectors have heard every excuse known to man and will still give you a high fine.
• Use facilities to check coats at events.
• Get smartly dressed for the concerts and operas or Clubs and fine dining restaurants.
• Expect to pay a small sum (50cents) to use some restroom facilities.
• Expect to pay cash for services in small restaurants and hotels.
• Watch where you walk. Vienna has many dogs they leave their greetings in many places.
• Let old Viennese ladies move in front of you everywhere - if not, they will probably push their way in front anyway - a tradition
• Tip the waiters/waitress after your meals; not necessarily 10% of the total but you can round-up to the nearest Euro.
• Expect to be chased out of the shops 5 minutes before closing time.
  

Don't

• Expect Austrians (and Europeans in general except the British) to respect the custom of waiting your turn in line.  People will sometimes try to push past you, but a stern look right in the eyes is enough for them to retreat and needs no translation. 
• Expect everyone to speak English.
• Expect every place to have air-conditioning.
• Expect iced water
• Expect english language menus in all places. Your waiter can usually explain everything
• Expect to find diet drinks and non-smoking areas everywhere.
• Expect waiters to bring your bill after eating. They will present it only when you ask. Many here will sit for some minutes talking after finishing a meal.
• Expect stores to be open late evenings or Sundays; on weekdays, most stores close at 6.00 pm (except in the 1st District) and on Sundays, all stores are closed.
• Make noise after 10 pm (except on New Year's Eve!!).