AK isn't my favorite park, and it isn't my kids' favorite park. But the Lion King show is spectacular, and the safari is fun. There's a play area in Dinoland, and a dinosaur ride that's like Dumbo but with 1/10 the lines. The Finding Nemo show is supposed to be great but we didn't make it there. Skip the bug movie - trust me. If the adults like roller coasters, Expedition Everest is fun. Oh, and the character breakfast at Tusker House is quite good, IMO.
If it's really what the adults want to do, you'll find plenty for your twins to do for half a day or so, too. I'd personally rather spend my limited time in Epcot, but I think that Epcot is a park that grows on you - it isn't an instant favorite for a lot of people.
I think that Saturday is supposed to be the busiest day at MK - you might want to consider that, too.
Single mom to
DS ("twice exceptional") - September 2002
DS - February 2006
DD - July 2009
DD - July 2009