Roman Catholicism plays an important role in daily life and criticism or jokes about religion are not appreciated, despite the general good humour of the people. Music and art are also important aspects of Polish culture. Shaking hands is the normal form of greeting. Normal courtesies are observed when visiting private homes and it is customary to bring flowers. Fairly conservative casual wear is the most suitable attire, but dress should be formal when specified for entertaining in the evening or in a smart restaurant.
Smoking is restricted in some public buildings.
Military installations such as bridges, ports, airports, border points, etc should not be photographed. Tipping in self-service restaurants is not expected. Tips for porter's services in hotels and train stations are customary but amounts are at the traveller's discretion.