I'm surprised it took so long for someone to mention Innoventions. Kids could easily spend almost a whole day there. Aside from what Yellow Shoes mentioned, there is also a little "dome" inside the innoventions to your right (West?) that houses three "Dance Dance Revolutions". If anyone dosen't know what DDR is, it's basically a video game for your body. You stand on mats and jump and tap your feet on the arrows in beat with the music, and according to what the video screen tells you to do. You keep progressing through the levels, which get faster and faster, until you fail. At the end, it tells you how many calories you burned. They sell it in stores for an astronomical price, and there are a bunch of DDR's on the Boardwalk in NJ, but it's like $2 a piece to play, and in Epcot, it's free. My sister and I could have spent all day there.
Link to DDR:
http://www.ddrfreak.com/aboutddr.php
I also recommend getting the passports. It includes the passport, a button, and stickers for each country. I've seen kids dragging their parents from country to country instead of vice versa.
Link to Passport:
http://fly.hiwaay.net/~jlspence/pportex.jpg
http://fly.hiwaay.net/~jlspence/pportjp1.jpg
http://www.mainstreetmegastore.com/prod_images_large/TPAAAZZZZZZ1001247.jpg
In the Imagination pavillion, Space Pavillion and Innoventions, you can send a 15 second video email to yourself or friends. Each one has a differnet theme, ie, Space: you are an astronaut, Innoventions: you get a Spaceship Earth background, and Imagination: you get to dress yourself up with clipart features) We always send one to ourselves so we have something waiting at home to remember our vacation by. We usually say what we did, or what we plan to do that day, and include the date. It's really fun.
There are characters in Epcot. They go with their respective countries. Beauty and the Beast in France, Aladdin in Morrocco, Winnie the Pooh in UK (or canada?) Mary Poppins, etc. Norway also hosts the princess breakfast which, if you have a daughter, would love. And, it's easier to get PS's for then Cinderellas Royal Table.
Each country has live entertainment. Off Kilter (!!!) in Canada, British Invastion (who sound EXACTLY like the Beatles) in UK, Mimes in France, "Mikuki", who creates works of art out of rice candy for the children for FREE!!!!!!!! in Japan, Belly Dancer in Morroco, Oktoberfest in Germany, Living Statues (which are the best) in I think Italy, Chinese acrobats in china, etc etc. The live entertainment is one of the best parts of Epcot, and I think your children would love it. Also, look out for the Garbage Can guys in Future World. They are amazing.
Look for "Push" the talking trashcan in the Electric Umbrella (I won't give away his secret here, but look for a garbage can with wires attached, and then throw something away and listen carefully)
Get free Coca Cola products by visiting Ice Station Cool in Epcot's Future World. As you come into the park, it's on your right side across from the Fountain of Nations. Go through the igloo and come out in a Coca Cola store and a place to sample Coca Cola products from all over the world! I'm sure everyone in your group can find something they like to drink, and best of all it's free for all the samples you and your family want. Give Beverly a shot...it's wonderful :hammer:
And (I promise this is it) There is something new called Goofy's scavanger hunt, and you get a free signed poster of the characters when you complete it. I'm not sure what it is, maybe someone can elaborate for me.
Oh, and I would say do this park first so your kids aren't comparing it to the MK or Studios. It can be fun in it's own way.