M.W.
We went on a cruise to Mexico when our kids were almost 3 and 6 months old. I was breastfeeding our 6 month old. They were fine and didn't get sick. We take them with us everywhere. I say, go for it! Take your family and have a great time!
As a precaution get everyone in to a chiropractor before you go to make sure your bodies are as strong as possible so they will be able to fight off any ear infections, colds, etc. That's what we do before every trip!