We use to visit the museum in Prerov nad Labem during the Christmas time. It is half an hour drive from Prague, very close for us. You can feel the Christmas spirit everywhere, rich program demonstating Bohemian Christmas customs is held on weekends and Ella is always looking forward to the nativity scenes.
Do not forget to visit the museum's gift shop nearby and take some hot drink with you before strolling around the museum. A restaurant is close as well. Although Prerov nad Labem can not compete with the museum in Roznov pod Radhostem, or on Vesely kopec, you can spend a pleasant afternoon here anyway. We love coming back every Christmas.