Due to a Pinkie-related mix-up, Twilight et al end up sharing a vacation with a thoroughly unimpressed Cranky Doodle Donkey and a much more laid-back Matilda. Yet it's hard to stay mad for long in a city full of national treasures, exotic hybrids, and glorious histories.
Unless, of course, a pair of criminals decide to wreck up the place. Saddle Arabia is not all romance and sightseeing, after all. And it's not just thieves and bandits that make life difficult; the local constabulary are net exporters of difficulty in and of themselves.
Continuity: This fic is set during the middle of Season Three.