My husband and I spent our 25th at WDW two years ago and had our anniversary dinner at CA Grill. like you are planning and it was wonderful. For dessert they brought a chocolate cake with a huge slab of white chocolate over it and they had written Happy 25th Anniversary with our names. It didn't cost us anything. I believe we have eaten at every fine dining place in Disney World, Victoria and Alberts, Artist Point, Blue Zoo at (either the Dolphin or Swan, can't remember) and many, many more but for romance, Jiko at Animal Kingdom Lodge. It's the lighting and the food. It is very romantic, great ambiance, can't say enough about it. Todd English's Blue Zoo was fabulous too. You will get special 25th anniversary pins if you let it be known in advance that you are celebrating. Congrats and have fun.