I feel like we are kindred spirits! I'm also a mom of 5, and we have been doing family trips every couple of years! And our next trip is this spring! I am following your report eagerly

and will be stalking all the same RS threads. Our most recent trip was September 2016 - we did our pregnancy announcement from the parks (4 sets of ears with kids' names and one with a ? - and believe it or not, it was hubby's idea! He patiently puts up with my obsessive planning, but doesn't get into it until we can see the park.
I love the shirts you are putting together! I've never tried doing that - think it is something I could figure out for this trip? I've been wanting to do something more homemade, but had been looking at making journals and autograph books. Shirts might be more practical though!
*** Edited to add - hotels are so tough for us now, I went ahead and did a house rental for this trip. We are bringing my brother in law and his 7 yr old daughter and my other brother in law with us this trip so we make an even 10 and the house rental + promo tickets was significantly better than even good neighbor deals.