Midweek during school should be OK. But still, it is a huge pain in the butt to drive out from Newport to DL especially when the beach is calling your name.
The last few times I went to DL or DW I stayed at a Disney property. This gave us an extra hour in the morning before the park opened for the day (or after it closes, depending on the day) and also gave us a place to go for a rest when the kids got burned out in the middle of the day.
Definitely find a way to stay closer to Newport for the second day...