Each trip is different and depends on what day we arrive but MK is always our first stop unless we arrive on a Saturday.
We always check in and then head to MK to Fantasyland. If it's a Saturday then one year we took it easy and rented a boat and swam. One year we spent the Saturday at MGM first.
Haven't decided yet about this year as we'll arrive on a Saturday from Universal but we might try to catch Spectromagic and Wishes Saturday night!