Pretty much all the disney restaurants offer the traditional Thanks dinner, the exception being the WS countries. I would recommend calling now for a PS. The most popular is LTT at the MK. Take a look at the resort restaurants we have enjoyed this holiday at many of these restaurants and they were great.
Check out the following website, the info is from previous years but will give you an idea of what to expect.
http://www.wdwig.com/menu/men_thks.htm
Suggestions: Whispering Canyon, Artist Pt, Trails End, Concourse St., Yachtsmans St, Flying Fish, Boatwrights, Brown Derby, PT Cafe.