D.M.
Hi Amy,
Go go go. The odds of contracting swine flu are miniscule and even if by some odd chance you do, every case in the US so far has only produced mild flu symptoms which can easily be treated. Take this opportunity to have a lovely vacation with your husband and little boy before the baby comes.
I am off to Scotland next week and Greece in June and there is no way I would cancel either trip. I used to work in the World Trade Centre and the one thing I learned from that experience is you can't live in fear of things that are beyond your control.
Have a fantastic time in Maui. All the best, D.