I would do three MK days. That was our original plan on our 5 day pass (3mk, 1 Epcot, 1 ak) but we switched out one of the MK for HS and I regretted it. My 4 and 5 yos both said they would have rathered a third MK day and I would have too! We did everything we wanted in the two days but would have liked to repeat even more!