Depending on your budget you could book a nice meal somewhere like Cali Grill (maybe around the time of fireworks) or Narcoossee's, order a mini cake for her (check out the cake thread on the restaurant board for details). You didn't mention if you'd be in a park, but if you are, you could book one of the dessert parties. Spa time at one of the Senses spas, you could even pair that with afternoon tea at the Garden View Tea Room at the GF. Maybe even eating and drinking around the world at the Food and Wine Festival or Skyliner pub / restaurant crawl (you could do a progressive dinner).