I was a little worried that giving them the playmobil advent calendar on the first day would make the other activities seem like a disappointment, but luckily that hasn't been the case :)
I knew which book they girls were going to open, but I didn't know what the activity was going to be until right before they opened it....it was super simple, and they squealed with joy when I told them. They read the book with their daddy, and then they got to listen to The Polar Express audiobook while they were going to sleep. That's it. They LOVED it. Simple is good. And our girls LOVE audiobooks!