Hello Eleanore,
Thank you for submitting your question to the Disney Parks Moms Panel!
Here are a couple of "must see attractions" my little ones can't live without (and your 2 and 5 year olds can ride): "Toy Story Midway Mania" and “Disney Junior – Live on Stage!” at Disney's Hollywood Studios; "Peter Pan's Flight", "Buzz Lightyear's Space Ranger Spin", "It’s a Small World” and the "Magic Carpets of Aladdin" at the Magic Kingdom, "The Seas with Nemo and Friends" at Epcot and "The Boneyard" play area at Disney's Animal Kingdom! Also, you don't want your kids to miss meeting their
favorite characters!
As for dining, it tough to choose as they are both delicious buffets! Donald's Dining Safari, (which is the character dining at the Tusker House at Disney's Animal Kingdom) features Donald Duck, Daisy Duck, Goofy and best of all, the mouse himself, Mickey Mouse. (Also, you may want to keep in mind that you will be meeting Mickey Mouse and Friends when you dine at Chef Mickey's.)
The Crystal Palace also features character appearances by Winnie the Pooh and Friends. I guess the tie breaker would be which characters are the kids' favorite.
I hope this helps as you put your plans together for your vacation. If you need any other planning assistance, please feel free to ask me more questions!
See Ya Real Soon!
Yael