Hi, Andy! Congratulations on your anniversary. That's such a wonderful milestone, and I hope you have many magical memories of those happy years.
For the days you are staying at a Walt Disney World resort, don't forget to mention on your reservation that you are celebrating your anniversary. You never know where the pixie dust will fly, so you want to make sure everyone knows you're celebrating. Also make sure you have it noted on your dining reservations. You'll either want to ask at your hotel front desk or at theme park Guest Services for your celebration buttons. It's kind of cool to walk through the park and have people wish you a happy anniversary.
For a most amazing anniversary celebration inside Epcot, I can't recommend highly enough
Monsieur Paul. It is such an upscale feeling restaurant right there in the middle of the theme park, but you'll be perfectly in place in your shorts and t-shirts. The food is authentic French cuisine, and they have both a prix fixe menu (fixed price) and an a la carte menu.
Another great spot in Epcot is
Tokyo Dining. You'll find a great selection of sushi and other Japanese favorites in an absolutely lovely restaurant.
If you want to venture to one of the signature dining experiences outside of the parks, my family and I love
Jiko. The braised short ribs are delicious, and they have one of the best filet mignons anywhere.
Happy anniversary, and have a wonderful vacation!