Thanks for your replies.
We're just doing a non-stop from Boston which is a quick 1hr. We plan on doing carry on too. I rather not fly in the night before and stay in a hotel and I don't really think it's necessary since it's such a short flight. I read that you're not allowed in until your designated boarding time. Just don't want to arrive super early at the cruise terminal with my 2 young ones and have nothing to do, esp. if the weather is cold, rainy, etc.
we will be doing the same flight just the following week-9/12....more nervous about catching our return flight at 11:30 in nj than coming in at 11am on arrival day.