Did many things previously, I got my ex 21 gifts on her 21st bday. The idea isn't all that original but nevertheless, the thought and efforts put in was really a lot.
Then, i also queued up for macdonald's hello kitty, at free sitting concerts a day before to get front seats and many more foolish things to please her. At the end of the day, if a gal needs you to do all these all the time, it is not sustainable. She will be happy and touched initially, after sometime, all these will be taken for granted when you show hand your affection and creativity. Each time, I just let my creativity flow on what would heart a person's heart and went all out to create it.
In everything, balance is important. Little gestures and thoughtfulness is great. Over doing, the effect will be counter productive.