We're going to be staying off site. But I'm thinking yeah, a lunch-time flush may work best. We could leave parks around 1:00, do her flush, have a swim, then head back in around 4ish, to the new park.
Though, are there parks that still aren't opening until 10 or 11?
I wish we could just do one full day per park, but I don't think it's possible this time, $-wise or time wise. Though maybe we could do a full day for MK, a full day for one other park and then just take one day and split two parks... if that was the case, which two parks would you split, and which one would you add as the second full day?
I agree your only choice is to go back to your resort for the flushing. What is available in the parks sounds like it would not meet your needs.
I don’t remember anyone else detailing what‘s available, so thought it might be helpful to do it. The Companion Restrooms are private restrooms with a sink and a toilet, but they have ‘public handicapped restroom’ type toilets - raised seat toilet with just a large pipe at the back, which which probably not give a secure way to attach your child’s toilet seat. They are also usually quite busy with a line often waiting to get in and people knocking on the door every few minutes while we are inside.
First Aid also has Companion Restrooms, either 1 or 2 per location. Other than location, they are similar to the Companion Restrooms in other parts of the parks.
Right now, AK is open 8am to 7 pm, MK and AK 9 to 9 and Epcot 10am to 10pm.
With park hopper tickets, guests can currently hop from their Reserved park for the day to a second park after 2 pm. Keep your parking receipt to avoid being charged again for parking when you return/park hop.
MK has the most rides/attractions, so definitely a full day. Some people actually spend 2 days at MK, or an additional 1/2 day there after the first full day.
My suggestion would be to look at what each park has to offer and what your family would like to see/go on. Some people consider AK and Hollywood Studios to be 1/2 day parks because of the small number of rides. But, many of the rides in those 2 parks also have long wait times.
Some shows have limited numbers of showings per day that you would need to work around if you want to see them - like Festival of the Lion King at AK or Beauty & the Beast at Hollywood