We'll be there that week too! I'll be the one chasing three little girls in three different directions, probably covered in glitter from their constantly shedding princess dresses
We weren't originally planning on going to the parks that day since our original plan was to fly in the evening of the 25th and then spend the 26th-29th at the parks. However, we ended up finding an awesome airfare deal to fly in early morning on the 25th instead and recently booked that.
So now we're considering doing the parks on the 25th in the afternoon since we'll have to wait to check into our hotel for a bit and it isn't a ton of extra $$ to add on an extra park day. I'm thinking we'd mostly do Disneyland that day. We're hoping to keep the trip a complete surprise from our kids until we get there and I've always just envisioned taking them to DL first and seeing the castle for the first time.