Three words should describe your travels as a twenty-something: beautiful, rough, messes. Dancing until the sun comes up, paying the least amount of money for the least fanciest experiences out there -- that's what this is about. Wandering as a "millennial" means taking in as much as your senses deem physically possible. Try everything twice, and then try it again.
So if you're a twenty-something who's never once experienced traveling when you're young enough and broke enough to "go with the unexpected flow," please start reading. And start reading fast.