Is winter — you can
For example, there are options on how to make a surprise for a girl on a walk. This will require flowers. Best roses — they are the least prone to damage. If on the street is winter — you can invite your favorite to some kind of sparse place where flowers will be inserted along the edges of the paths in the snow. Of course, the flowers will need to be put in advance, so someone else who can lead them will have to be attracted to the creation of a surprise while you get there with your sweet. If there is no snow, it doesn’t matter. You can repeat the same, or just hide in a reliable (but easily accessible!) a bouquet of her favorite colors, and bring her for a walk to this place. Imperceptibly pull the bouquet and completely unexpectedly give it. Such a surprise for the girl will undoubtedly be remembered for a long time.