I am planning a trip to Japan with my daughter (10 years old)

I have never been abroad before, but my daughter has wanted to visit Japan since she was 9. I would like to take her before the end of the year... How much would the expenses be for a 3-day, 2-night trip?
I want to show her expensive things and feed her expensive food, but realistically that might not be possible, so please give me some advice on what kind of budget I should set for an average trip.