1. You start wondering if your 12-year-old tour guide has plans for dinner.
If you’re eyeing that single mom struggling with her spitting up six-month-old in one arm and three suitcases in the other, praying that for just one instant you could trade lives, it’s time.
Unfortunately, the universe isn’t Freaky Friday, so you’ve no choice but to take matters into your own hands. Seize the opportunity to ditch your compatriots when “Rainbow,” that ironically black-haired hippie from the hostel last night, appears across the street from the umpteenth souvenir shop you got dragged into. Bribe your famished-looking tour guide with sodas and sweet treats and get a personal city rendezvous all your own. If odorous, pre-adolescent strangers are starting to catch your eye, there’s a reason for it. And it’s not just that you’re desperate — it’s that they’re probably more interesting than who you’ve been hanging out with.