The only thing I would add is to make sure you take lots and lots of pictures. Every time we take a trip (and we've been going to WDW practically since it opened), we make a special photo album of us enjoying ourselves in every possible way. We take silly pictures, eating pictures, standing in line pictures, character pictures, sleeping pictures, getting there pictures, leaving there pictures, pictures of CM's, checking in pictures...
Sure, everything is digital now, but we're old and haven't really mastered all the new technology, so we have our Disney albums (with the physical pictures) all together on shelves and our children and grandchildren still love looking through them and reminiscing.
Throughout the years, we've loved seeing the pictures of 'us' in front of some of the Disney icons; boy how we've changed! We still have fun, though.
This is one trip you will want to document completely; it will be special to all of you always.