In '99 my mother joined us and it was her 60th birthday. We took a seating in the Liberty Tree Tavern near the Park closing time. This way you can spend all day in park then have dinner while everyone else is leaving, also the dinner was more private. One thing I did was called the Disney Chef and ordered a special cake. It was a bit pricy but worth it.
My mother also wore a birthday shirt. And, as someone else mentioned, to the embarrassment of us all held a sign waiting for the parade saying today she was 60. Because she did this they picked her to be in the parade. In advance of parades Disney folks scan ahead for this kind of thing. She had a ball.
The dinner and attention was awesome.
Hope this helps.