We're going to have to check bags, and I think we will take 2 fairly large bags (for me, DH and DS3). We're going for a week in January and I am concerned the weather could be all over the place, so I need to pack a good variety. We're planning on doing laundry while we are there too, so we can reduce the amount of stuff packed.
I'm also planning to either have some things delivered, or if my dad rents a car, to go to a grocery store for some neccessities, like pull-ups, wipes, laundry soap, etc. I am also trying to minimize heavy things like shoes. I will wear my heaviest shoes on the plane, and pack light ones like flip flops and super lightweight sneakers. We'll also wear layers on the plane, so we don't have to pack heavy fleeces and things.