Epcot isn't just for adults anymore. The first year we went to WDW we skipped Epcot because we were told the kids would be bored. We decided to go to Epcot this past trip and THEY LOVED EPCOT. After the MK, Epcot is their favorite. They are 7, 4 and 1 (almost 2). They loved going through the different countries. Kids don't always have to wait in long lines for a two minute ride to have fun. There are opportunities to see characters, a ride or two and eat yummy food. It would be a more "relaxed" day than your MK day. So, it might be a nice change. Also, Illuminations was their favorite fireworks show. It was a nice production with the globe in the water, music and fireworks. A nice way to end our evening. So, my vote is for Epcot.