I guess that depends on when you are doing it. If at the end, then it would give you a chance to do some laundry while the kids swim. There's bikes and boats over at POR as well. I could see sleeping late, on the last day, doing some laundry. Going for a walk over to POR, maybe even a carriage ride in the evening for all 4 of you while Illuminations is going off.
So, yes you could have a great relaxing day at PO.