About taking the laptop, check your airline's baggage policy for carry-ons. We usually fly USAir and can take a personal item, such as a purse, laptop, briefcase, or diaper bag in addition to a carry-on bag. That's how we take our laptop and, for now at least, it doesn't cost us anything extra.
We use our carry-on allowances for other things so the laptop would have to be checked. It gets a bit heavy if I stick the laptop into my carry-on bag. We always pack one carry-on bag with one set of clothes each and our b/r stuff and swimsuits. My carry-on will be for other incidentals like my planning books (with all our ressie #s etc., purse, camera etc.) My DD carries a small backpack with her blankie and toys, books etc. So... I think we will just leave the laptop at home this time. We are flying Delta down and United back and both airlines let us only check one bag each without charging extra. We always leave a little room in one suitcase so we can do some shopping. It will all work out. Thanks for the tips though!!