Vacation could go wrong due to circumstances beyond our control. Even if you have planned the vacation for ages, there are several things that we cannot just foresee. It could be as worst as the weather can turn out to be bad or the airline lost your baggage.
Sometimes even simple problems such as the hotel amenities are not good and complete. It is also good to bring your own toiletries like soap, toothbrush and even shampoo (especially if you have a special hair loss shampoo). Bringing your own stuff could lessen the hassles of your vacation. It can minimize stress, the primary reason you are out on a vacation is to relax and not to stress yourself.