Well this is a toughie. Normally I would say skip AK. But with the ages of your kids into consideration, they might really enjoy it. EPCOT might be worth skipping...
Here's an idea-- why don't you get park hoppers, and try to squeeze 2 parks in one day? AK is only open until 5 anyway. Maybe you can do AK in the am, and skip over to EPCOT at night and catch illuminations. Just a thought.
I only go on a few things at AK, but I can never skip a park completely if I'm there!!!! Oh and have fun-- I went the first week in March this year. Crowds were low and weather was nice. I hope it's the same for you!