Write about a perfect moment.
You can write this as a scene in a play, a TV show, or a movie with scenery details. Include characters in this scene and include location (a specific room, a certain place).
You can include details about the weather, time of day or evening or night, time of year, the mood of each person or the emotional feeling of the people in this scene.
Or: Just write about a perfect moment.
You can write fantasy or fiction. Or you can write about what really happened.
A perfect moment. Just write!