When visiting Ujjain, it's important to adhere to local customs and etiquette. Due to the city's religious significance, it is recommended to dress modestly, especially when visiting temples and other religious sites. It's customary to remove your shoes before entering temples. Tipping isn't a common practice in Ujjain, but it's always appreciated if you receive exceptional service. Additionally, it's polite to greet locals with a 'namaste' and show respect for their culture and traditions.