You might like to pick up an Epcot WS Passport for your kids.They are available everywhere in Epcot and also at DTD MktPl.The CM in each country will write a note to the child and put a special stamp in it for them.There are stickers of pictures and flags of each country with the passport that your kid's can put in themselves.Be sure to visit the Kidcot Stations.That's where
the CM will usually be signing the passports this is where the craft for your kids to do is located.Your children will get a mask to decorate.As you make your way around WS they add something to their mask from each country.It makes a nice free souvenir to take home!
Personally I think you're trying to pack a whole lotta stuff into that time frame with the ages of your kids...y'all might just start feeling rushed and not have a good time.
jerseydizdreamer for not having any kids is a wise man!

So much of what he said is true...I've tried the "let's see everything" trips and they are our families least fond memories!
Here's some of the things I know kids like...maybe pick one or 2 and then let your kiddies play and lead the way as Richard said!And you're kids might just "learn" something along the way! SHHHH! Our secret!
Space Ship Earth...the audio antimatronic figures are some of the best left in WDW.The laser lightening towards the end is really cool.
The Land...Food Rocks...food comes to life to sing some familair songs on the subject of good nutrition.
Journey into Imagination...the ride...sorta lame but the kids like it!Figment, the lavender dragon, is the star of this ride.He's so draned cute! There is a fun interactive play area here too!Better than the ride IMO!

The Leaping Fountains outside the pavillion are a big hit with little ones.
Universe of Energy..the dinos are a big draw in our family for this ride/show.Might be a bit intense and boring for little ones if they aren't dino freaks...like my son!Good place to sit down, cool off and catch a few winks!
Wonders of Life...great inter active play areas here based on sports.We also like the snackbar that has fresh fruit.
Mission Space and Test Track probably not on your list this trip.All your children won't be able to ride as they are too small.
At night in front of Innoventions the sidewalks light up...kids of all ages are fascinated by this!
Onto WS...I've already mentioned the Kidcot Stations.They are located in every country.If you can't find it just ask a CM,they'll point you in the right direction.
Mexico...alot of times in the trees outside there are real,parrots perched out there.My boys like the Rio de Tiempo boat ride inside the pyramid.Reminds us of SmallWorld...look up at the ceiling at the end to see fireworks.My boys 9 and 10 still like these!
Norway...the Viking ship play area near the restrooms...great place to let them blow of steam.Also inside the one shop there is a
Lego Area where they can play.
China..the acrobat show is good.My kids also like the bird string puppets that you can purchase, small ones are around $8.You can play with them even if you aren't buying!
Outpost...the drums!!! Another great blowing off steam place!!!
Germany...the little train set outside.My boys love to watch this.Sometimes there's even a Hidden Mickey to found here.
Italy...the Living Statues...totally AMAZING!!
American Adventure...we always find characters here.
Japan...the person who makes candy figurines.
Morocco...the alleys are fun to wander down...Jasmine,Aladdin and Genie hang around here.
France..blanking here...sorry!Have to come back later on this one.
UK...the maze in the garden and my boys along with Dh and me love to listen to the British Invasion band.They play alot of Beatles tunes.
Canada...has my son Erich's all time favorite WDW treat...Beavertails! Look for the Hidden Mickey on one of the totem poles.
There are various fountains throughout Epcot that kids like.Some they can get in and play! Ice Station Cool in FW is a fun place too,to try out different Coke products from around the world.
Epcot is kid friendly...y'all will have a great time...just don't try to pack too much into one day!!