In bars and restaurants
Don't hesitate to ask to see the food and drinks menus, so that you don't get a surprise when the bill comes. All the prices must be shown inclusive of tax.
In concert venues and cabarets
Avoid certain Parisian cabarets, particularly in the Pigalle district, where the staff try to solicit customers in the street. Once inside, female company will be forced on you and you will be made to buy drinks at very high prices. Providing information to customers on drinks and services is compulsory.
Instead choose large institutions which do not approach customers in the street, and clearly display their prices inside and outside.