You are planning to go on a vacation then do take along necessary items for your trip so that you don't end up facing any kind of problems in the middle of your vacation. Nine out of ten times travelers tend to forget to carry important things which they need on their vacation and it can cause them unnecessary hassles in the middle of the trip.
If you are on some kind of medication then to take along your drug prescription as advised by your doctor. There is always a chance that you may not be able to find the concerned medicine at an unknown destination. One more thing, do not forget to take your medicines on time while being engrossed in your vacation and it would be better to place reminder on your iPhone or Blackberry calendar.
Finally, do make a note of all important items to be carried along on the trip weeks before you leave so that you can pack them and not forget at the last moment.