When traveling to Switzerland, there are several cultural and practical faux pas you should avoid to ensure a smooth trip. First, never assume you can "wing it" without a transport pass; Swiss trains are world-class but incredibly expensive if bought as individual point-to-point tickets, so failing to get a Swiss Travel Pass can be a massive financial mistake. Do not show up at a restaurant without a reservation, especially in smaller towns, and avoid being loud or boisterous in public spaces, as the Swiss deeply value tranquility and "quiet hours" (often after 10:00 PM and on Sundays). Avoid trying to pay with Euros in small shops; while some large retailers accept them, you will receive a poor exchange rate and get your change in Swiss Francs (CHF). Additionally, do not expect shops to be open on Sundays, as most businesses—including supermarkets—are closed for the day of rest. Finally, avoid being late; Swiss punctuality is legendary, and a train or a dinner reservation will not wait even two minutes for you.