Use those lozenges called Cold Ease and try to rest once in the afternoon and get to bed early, I know this is a tall request just prior to a vacation. Also, get into your Doc. TODAY, there are anti viral meds you can take at the very begginnig of the cold only. Your children may have already been exposed so, be sure they are getting lots of orange juice and good nutrition. Better check with your pediatrician and pack the decongestants. Also, ask your Doc. about anti-viral meds for dad, he is potentially the biggest baby in the bunch (if he is anything like alot of dads, I know).
Last year my son got really ill (he actually vomited all over me on the bus to EPCOT - that was a fun ride. He was out for two days and I was out for one) Thankfully, this was an 11 day trip but, it still stunk (literally, hee, hee, hee).