Remember that Liechtenstein is a traditional Catholic country. On a Sunday the streets are all but dead except for the tourists and the tourist shops. Liechtensteiners are very proud of their national identity and would take offense to being wrongly labelled German, Austrian or Swiss. Those who may feel inclined to denounce the monarchy as a system of government should be advised: the Prince is well loved and very popular, and certainly he should be held in high esteem when discussing national politics.
Overall, customs and etiquettes of Liechtensteiners are similar to the Swiss.