I agree with all the other advice ... and make ADR's ... advanced dining reservations NOW if you have not already done so. Some good choices are:
Whispering Canyon (at Wildnerness Lodge you can get there from MK easily), Chef Mickey's at the Contemporary, Liberty Tree Tavern if you want another character meal, Kona Cafe and Ohana (Poly), and any at EPCOT ... but I like Le Cellier, Teppanyaki, and Rose and Crown. Oh, and at MGM ... my youngest like Sci-Fi and the oldest like Hollywood and Vine. Good luck!