There isn't a specific Anniversary forum but you'll find lots of folks seeking the same information as you on this forum, the Disney for Adults forum, the restaurant forum...heck, I guess most of the Trip Planning Forums!
Congratulations on your upcoming Silver Anniversary!!
Have you considered a vow renewal? If that's something you'd like to investigate, visit the
Disney Weddings website. If that is out of your price range, you might consider seeing what the Swan/Dolphin and DTD resorts/hotels might also offer.
You can contact
Gifts of a Lifetime to see if there is something they can help plan.
You might consider a special tour:
Disney World Backstage Tours.
Or a
fireworks cruise!
Consider a special dining experience that maybe you haven't tried before...private dining at your resort or maybe Victoria and Alberts.
Definitely make sure that you let everyone know when you are making room and restaurant reservations that it is your anniversary.
I'm sure others will have lots of ideas...