Well, we don't have a mall (close enough for "hang out"), so the kids have never asked. It makes me wonder, though, if they ever would be interested in that sort of thing.
I voted "something else" because - I suppose - I'd make my decision on a case-by-case basis: how many other kids? what other kids? how long? etc.
Barb, if your dd wants to go to The Mall in Columbia, I definitely think you made the right decision. That place is way to chaotic for two 12 yos alone. Maybe in a year or 2.