1, catch a bag of fireflies in summer, take her to the wild, then let her blindfold and release them in the dark. When it comes out, tell her you can watch it.
2. Find a place with dark wind, high stars and a large area of water in winter.
Better blindfold her and take her away! Then row to the middle of the water lake! Tell her she can watch it.
In both cases, we should choose a period of good relationship, which is more romantic and won't feel artificial!