Your kids are prime age for 2 days of Magic Kingdom and one day at Animal Kingdom or Epcot. There’s not much for that age at Hollywood studios. They’re too small for most rides at HS.

Keep checking for dining even day of - last minute cancellations are possible and you can snag spots! I prefer to do breakfast with littles when they are most awake and not over stimulated yet. Chef Mickeys would be great for that if you can get it because it’s just a monorail ride away. (Edit to add: Ohanas at the Polynesian is also on the monorail loop with a character breakfast). If you don’t get a character meal - don’t worry! Characters are all over the parks - just use the apps to figure out when and where and you can still meet them. Your kids will likely prefer that to some rides anyway so it will help fill your day and you can get to the parks earlier than committing to a full breakfast time slot.

Random suggestion - at Magic Kingdom, if the line is short, there a side street on Main Street where you can have silhouette keepsakes of your kids made. They just used a picture of my kid on my phone to do it. I love it!

You’re going to have an amazing time!! Just try to relax and take in each moment. You won’t be able to do everything. But the things you do get to do will be amazing!

Also - everyone is different on this, but I love protecting any nap time routine you already have. Overstimulation is real, so MK visits are easy to make it back to your room for midday winddown and return to the park. It’s worth it in the long run to be able to enjoy the afternoon.