Paris offers a wide range of attractions and activities even on Christmas day. Many museums and monuments remain open, such as the Louvre and Notre Dame Cathedral. Christmas markets are also a popular attraction, offering various holiday-themed activities and delicious treats. Additionally, many restaurants and cafes are open for those looking to enjoy a traditional Christmas meal or a delicious coffee break. However, it's important to note that opening hours and services may vary, so it's always a good idea to check with specific establishments in advance.