What a sweet idea!! HMMMMM.. Make reservations at Blue Baybou and let the CM know that it is your anniversary - they might do something special for you . It is also one of the most romantic places to eat inside the park with the stars and the lightening bugs. very nice... ask to sit next to the water...
There are some nicer restaurants at the disney hotels.. Napa Rose I heard is beautiful.
Disney does offer renewal of vows pkgs -- very pricey $$$. Maybe stay at the Disneyland Hotel or the Grand Californian Hotel for a more pampered stay.
I believe you can get portraits done in the park as well - hand drawn or sillhouttes.
They also have Mickey ears as wedding gear (silk black for guys and white for ladies) - would be a nice touch to wear as you celebrate your happy beginnings
We had hoped to do a renewal of vows for our upcoming (November) 10th anniversary but decided to spend the cash on a trip to DL instead! Time flies when you are happy . Best wishes!!