We were just there with out 7 yr. DS and the MK was the best park. He just wasn't as interested in Epcot or MGM and we didn't do AK, which maybe you could do in the AM on one day and then go to the MK at night, which is a can't miss, being right there for the fireworks is awesome and the castle is so pretty at night! Reserve one whole day for MK and then another 1/2. That's my advice!