If you do a search here on the DIS boards you will lots of ideas that other peple have done for those special occasions.
Don't expect just because it is your anniversary or birthday that just because you mention it that WDW will do something for you. You will be disapointed because most times they don't do something for everyone having a special day.
If you want something on those days arrange and pay for it ahead of time. That way you know that it will happen.
You will have a great time just being there.