If I had to choose, Id pick MVMCP over the lights at MGM... BUT... we really love the lights at mgm too. Theres so much to do at the party without riding a single ride! Walking down Main Street in the snow, watching all of the special Christmas shows, the Christmas parade, the special fireworks, free hot chocolate and cookies all night !! The snow on Main street alone is worth the party admission. If your MIL says shes ready to go on Thursday, then Id definately go to MVMCP! If you get there after 4, you wont use up a hopper day on your pass. All you need is theparty ticket to get in. They are a bit cheaper if you buy them in advance too. You already have Epcot planned for Friday. Id try to get to WS when it opens at 11. Try and see the special holiday storytellers too. There is one at every country at different times throughout the day. Just remember that future world closes at 7pm except for a few of the bigger rides and attractions ( test track, mission space, HISTA, maybe Ellens Energy Adventure, are all open later than 7). If you are intereseted in seeing AK, you can get there and be done in half a day. You could go back to the room, rest, and head over to Magic Kingdom in the evening and catch Spectromagic. Then you can spend Sunday at MGM. Get a Fantasmic dinner package, and afterwards you can go see the lights. We are eating at hollywood & vine on thanksgiving because they didnt charge any more for the fantasmic package like the other restaurants did. Its a buffet. My DH mother went with his brothers family while we were there too. She's in her mid 70's and I never thought she be able to do a full commando style week with 5 little kids. SHe did!!!!! She was out everyday at all the parks walking from open till close ( in January). what a trooper! If you take it easy, you can still go everyday, hit all the parks and she will get to see a lot at all 4 of them.