You really are earning your ears. Good for you. Enjoy world showcase. Basically you walk around a lake visiting each country. Some have attractions/films. Canada, China, and France have films. USA has the American Adventure show. Norway and Mexico have rides (Norway's is better). But yeah pick out your restaurants. Make sure your there when the park closes for Illuminations, a great pyrotechnic/laser show.
Its 1 ticket for all of Epcot. Speaking of which, enjoy Future World, too. Test Track and Mission Space are thrill rides. Spaceship Earth, the Land, and Universe of Energy are good "educational" attractions. The Living Seas is a good aquarium. And Soarin' is great.
As for entertainment, check the schedule when you get there. I particularly like Off-Kilter in Canada and the British Invasion in the UK. But everyone has a favorite, so....
Of course, you probably can't fit all of this in 1 day.