A note to parents: Starbucks is not a playground for your kids. There are people trying to work here. Don't bring your kids here, feed them caffeinated drinks, and park them at a table while you wander off.
Yes, I understand that you're tired of your hellspawn and need a break. I've only known your progeny for ten minutes, and I'm tried of them too. But this isn't the place.
Instead, take them to a McDonald's with a playground. Wherever there's a Starbucks, there is probably a McDonald's nearby. And the McDonald's playground has an iron cage around it. Which is what your munchkins belong in.