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Traveling is a personal experience and the things you will need really depend on what you want to do. If you are going on holiday where you will be doing a bunch of things, I will pack all the necessary things I need at home and not worry too much about my trip. To cut to the chase, here's my list of essentials:
A flashlight. Good to have when you are out on a beach at night, or travel to an unknown land where you need to find your way around in the dark.
Cash in local currency. And make sure you have some singles. You can do this after you land in your destination.
Research the place before you travel. With that, you are making sure about what to do and where to go.