With small children and summer heat, we've preferred to have 2/3 days or 1/2 days. We tried a rest day and we tried afternoon breaks, and that didn't work the best for us.
Given that multi-day tickets aren't much more expensive and FP+, we liked to pop into a park every day (even arrival day) if nothing more than to use the 3 FP+ and/or eat a meal or enjoy a show
We will be there from sat-sat and I'm thinking of having a non park day the day we arrive and then one more mid week. WDYT?