Mystery flights are a great way to travel if you don't know where to go. The idea is simple, air lines book a flight to a destination within your country but they don't tell you where it is. They may give you a hint like 'pack for cold weather' or 'bring your swimming gear,' but the rest is up in the air. If you want to go on a holiday but don't really know where you want to go or what you want to do, this is the best way.
Going on holiday is very fun and exciting, and mystery flights just ramp up the excitement. The mystery destination could be anywhere! They are also great ways to see your own country. Many people will go and visit exotic land marks overseas before they visit them in their own country. Mystery flights are the best way to combat this, by seeing random places and things that you never have seen before.
If the mystery flight drops you off somewhere you have been before, you can use the opportunity to explore regions of the town that you didn't get to see in your last visit. If you have the time, explore the region a bit and view a town that you didn't see before. Or you can play tour guide for the uninitiated and show them your favourite spots around town.
Mystery flights will never take you places where you need another type of currency or a passport, so you don't need anything except your luggage, your ID, and a sense of adventure.