How to gift this πŸŽ„πŸŽ…β„

As a Christmas present, I plan on taking my sister to get our nails done and then go see a movie. I don't know how to give this to her though. I don't want to just write it in a card, I want to make it fun (she is 12). The movie theatre is having a deal on gift cards, so the gift card will have enough for me to take my sister, but then also my husband and I go some other time, so I don't want to give her the actual gift card. I'm going to hold on to that. I was thinking about making one of these string balls and putting the gift inside. Maybe get a set of fake nails and paint them different colors like the nail salon color samples (if you have other ideas, let me know). I'm still stuck on how to represent the movie though. I don't know when we would be going or what movie we would see, or else I would give clues to the specific movie.