>>56044813Take her to a funfair/amusement park and take her on whatever she wanted.
Cynthia is all business when it's time to be serious, but enjoys having fun when not on duty (the Legends special where she was helping out in costume at the fair, before realising she needed to investigate the happenings at Mt. Coronet). The best way to impress her is to not try to impress her, but to try and make her enjoy herself doing something fun.